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plants to 选择Light gets through, and this is essen- tial________plants to make the food[A] with[B] from[C] under[D] for

题目
plants to 选择

Light gets through, and this is essen- tial________plants to make the food

[A] with

[B] from

[C] under

[D] for

相似考题

1.Once he raised his head ___________ the automobile hood to talk to me.A. /B. fromC. underD. from under

2.Under her leadership, the group’s ______ grew from less than one million dollars to more than ten million.A dataBbudgetCitemDpiece

3.He hides behind door or creeps under a table to () from his enemies.A.escapeB.escapingC.escapedD.Have escaped

4.CPlants can’t communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds, chemicals that easily change from a liquid to a gas. A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as bugs and bees.Plants can also detect volatile compounds produced by other plants. A tree under attack by hungry insects, for instance, may give off volatile compounds that let other trees know about the attack, In response, the other trees may send off chemicals to keep the bugs away- or even chemicals that attract the bugs’ natural enemies.Now scientists have created a quick way to understand what plants are saying: a chemical sensor(传感器) called an electronic nose. The “e-nose” can tell compounds that crop plants make when they’re attacked. Scientists say the e-nose could help quickly detest whether plants are being eaten by insects. But today the only way to detect such insects is to visually inspect individual plants. This is a challenging task for managers of greenhouses, enclosed gardens that can house thousands of plants.The research team worked with an e-nose that recognizes volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds. Based on these interactions, the e-nose gives off electronic signals that the scientists analyze using computer software.To test the nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all common greenhouse crops. Then the scientists collected samples of air around damaged leaves from each type of crop. These plants had been damaged by insects, or by scientists who made holes in the leaves with a hole punch (打孔器).The e-nose, it turns out, could identify healthy cucumber, pepper and tomato plants based on the volatile compounds they produce. It could also identify tomato leaves that had been damaged. But even more impressive, the device could tell which type of damage – by insects or with a hole punch – had been done to the tomato leaves.With some fine tuning, a device like the e-nose could one day be used in greenhouses to quickly spot harmful bugs, the researchers say. A device like this could also be used to identify fruits that are perfectly ripe and ready to pick and eat, says Natalia Dudareve, a biochemist at Purdue University in West Lafayette, Ind. who studies smells of flowers and plants. Hopefully, scientists believe, the device could bring large benefits to greenhouse managers in the near future.49. We learn from the text that plants communicate with each other by______.A. making some sounds B. waving their leavesC. producing some chemicals D. sending out electronic signals

参考答案和解析

D
　be essential for“对……来说是首要的、基础的”，固定搭配。

更多“plants to 选择 Lightgetsthrough,andthisisessen-tial________plantstomakethefood[A]with[B]from[C]under[D]for”相关问题

  • 第1题：

    most of australia’s unique plants and animals are imported from other continents. ()


    参考答案：错误

  • 第2题：

    ［A］ beneath ［B］ from ［C］ under ［D］ beyond


    正确答案：C

    本题考查介词辨析。空格所在部分wondering... 是个分词结构，在句中作状语，wondering的逻辑主语是the driver，逻辑宾语是what引导的宾语从句。该从句中，coming up... the rear也是一个分词短语，作从句主语trucks的后置定语。空格处填入介词，其宾语是the rear（后面、后边、后部），根据文意，表示“从后面”应选［C］from。beneath和under都表示“在……之下”，beyond表示“在（或向）较远的一边”，不符合逻辑。

  • 第3题：

    23． From the passage，we can know it is ________for plants to grow in dry places．

    A． easy

    B． difficult

    C． impossible

    D． important


    正确答案：B
    23.B【解析】由第二段第五句“In very dry parts of the earth only a few unusual plants can grow.”可知 B是正确答案。

  • 第4题：

    The fact that a part of the cargo has already been discharged will not ________ the owners of the rest， under all circumstances， from claiming a general average contribution from the Shipowner．

    A.preclude

    B.include

    C.dilute

    D.pollute


    正确答案：A

  • 第5题：

    Before personnel are lifted from a vessel in a personnel basket, the vessel should be ______.

    A.directly under the boom

    B.moving away from the boom

    C.stopped dead in the water

    D.tied ti the boom


    正确答案：A
    在用吊斗提升人前，船舶应在吊杆下方。

  • 第6题：

    We found shelter from the rain under the trees.

    A: defense
    B: standing
    C: protection
    D: room

    答案：C
    解析：
    题干意为“我们躲在树下避雨。” 句中划线词为名词，意为“庇护，掩蔽处”。C项protection意为“保护”，例句：Every citi- zen may claim the protection of the law．每个公民都可以要求受到法律的保护。A项意为“防卫，防护”,B项意为“名声，地位”,D项意为“房间，空间”，故选C。

  • 第7题：

    We found shelter from the rain under the trees.

    A:defense
    B:protection
    C:standing
    D:room

    答案：B
    解析：
    本句意思：我们找到大树来避雨。shelter意思是“庇护，避难所，遮蔽物”，与protection （保护，防护）意思相近。defense 防卫，防护，防守;standing 站立，持续，身份；room房间。

  • 第8题：

    What is the correct procedure for adding an access point in WCS？（）

    • A、Choose Configure >Access_Point， then enter the AP MAC address
    • B、Choose Configure >Access_Point， then enter the IP address of the AP
    • C、Wait until the WLC downloads its code from the WCS and choose the access point from the list under the WLC option of the Configure menu
    • D、Wait until the AP downloads its code from the WCS and choose the access point from the list under the Access_Point option of the Configure menu

    正确答案:A

  • 第9题：

    In the SSCT， when you need to see the Channel Prices， what is the right action to take？（）

    • A、Download the BP version of SSCT from PartnerWorld
    • B、Enter the IBM authorized password in SSCT under User Access Level menu
    • C、Get the country price list from your country BP organization and import into SSCT
    • D、Apply the country channel discounts under the Quote menu choosing the Discount/Uplift option

    正确答案:B

  • 第10题：

    An administrator is looking for the "Open RestrictedShell Terminal" option on the HMC GUI. Under which panel is this option available?（）

    • A、HMC Management, but only from a local connection.
    • B、Service Management, but only from a local connection.
    • C、Systems Management, but only from a local connection.
    • D、Systems Management, but only from a remote connection.

    正确答案:A

  • 第11题：

    单选题
    As Chief Officer of a vessel underway，it comes to your attention that the vessel is，in some manner，unseaworthy. Under such circumstances the Master is required to take action upon receiving（）.
    A

    information of such condition from yourself

    B

    notification of such condition from yourself and the Second Officer

    C

    notification of such condition from yourself and any other member of the crew

    D

    notification of such condition from yourself or the Second Officer


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.
    A

    directly under the boom

    B

    moving away from the boom

    C

    stopped dead in the water

    D

    tied to the boom


    正确答案： D
    解析： 暂无解析

  • 第13题：

    Why did Shaefer put the paper under glass?

    A) To prevent Rosa from feeling the print.

    B) To stop the reflection of heat.

    C) To make things as difficult as possible.

    D) To stop her from cheating.


    正确答案：A
    答案：A
    [试题分析] 推理题。
    [详细解答] 第二段中提到：To test the possibility that the cards reflected heat differently，he heated some and cooled others without affecting her response to them．He also found that she could read newsprint under glass，so texture was giving her no clues．根据文中所说Rosa Kuleshova的特异功能，是不看不摸，能感知事物，这里，用玻璃，显然是防止触摸，以增加实验的严格性。故答案为A。

  • 第14题：

    [A] From [B] Under [C] On [D] With


    正确答案：B

  • 第15题：

    29． Why are green plants and grass helpful?

    A． Because they can hold the water．

    B． Because they can stop the wind from blowing the earth away．

    C． Because they can keep the earth wet．

    D．All the above．


    正确答案：D
    29.D【解析】从第二段可知A、B、C三项内容全都包括，故选D。

  • 第16题：

    Both the Shipowner and the Charterer will be discharged from their obligations under the charter-party if it ______ frustrated．

    A.provides

    B.becomes

    C.contains

    D.comes


    正确答案：B

  • 第17题：

    What is suggested about the engineers from London?

    A.They are new to the Dawson company
    B.Bertrand Fournier is their immediate supervisor
    C.They have visited the Valbonne plant before
    D.They recently inspected the Geneva and Warsaw plants

    答案：C
    解析：
    第一封邮件第五行出现again，可知，他们以前曾经去过Valborme。

  • 第18题：

    He believes that from a military standpoint,the situation is under control.

    A:position
    B:point of view
    C:knowledge
    D:argument

    答案：B
    解析：
    本句意思：他认为，从军事角度来看，情形处于掌控之中。position的意思为“地位，位 置”;point of view的意思为“观点，看法”;knowledge的意思为“知识”;argument的意思为“争 论，理由”。standpoint的意思为“立场，观点”，和point of view的意思接近。

  • 第19题：

    He ventured that plants draw part of their nourishment from the air.

    A:dared
    B:endangered
    C:agreed
    D:prevented

    答案：C
    解析：
    本句意思：“他大胆提出植物从空气中吸收部分养分的观点。”agree：赞同，例如：Donna agreed to both requests．这两个请求唐纳都同意了。dare：敢于，例如：Only afew journalists dared to cover the story．只有极少数记者敢于报道这个故事。endanger：危及，例如：The debate could endanger the proposed peace talks．这一争论可能会危及提议进行的和平谈判。prevent：防止，例如：We were prevented from entering the site．我们被禁止进入现场。

  • 第20题：

    The partial loss of or damage to the cargo is not recoverable from the insurer resulting from natural calamities under（）in PICC Ocean Marine Cargo Clauses.

    • A、All Risks
    • B、FPA
    • C、WA
    • D、All Risks+War Risks

    正确答案:B

  • 第21题：

    An administrator is looking for the "Open Restricted Shell Terminal" option on the HMC GUI. Under which panel is this option available？（） 

    • A、HMC Management， but only from a local connection
    • B、Service Management， but only from a local connection.
    • C、Systems Management， but only from a local connection.
    • D、Systems Management， but only from a remote connection.

    正确答案:A

  • 第22题：

    单选题
    The passage warns of which of the following dangers?
    A

    Companies in the United States may receive no protection from imports unless they actively seek protection from import competition.

    B

    Companies that seek legal protection from import competition may incur legal costs that far exceed any possible gain.

    C

    Companies that are United States owned but operate internationally may not be eligible for protection from import competition under the laws of the countries in which their plants operate.

    D

    Companies that are not United States owned may seek legal protection from import competition under United States import relief laws.


    正确答案： C
    解析：
    从第二段第一句话以及“Internationalization increases the danger that foreign companies will use import relief laws against the very companies the laws were designed to protect.”可知，D为正确选项。

  • 第23题：

    多选题
    Consider each of the choices separately and select all that apply.　 Which of these can be inferred from the fact that the French built orangeries for certain tropical plants?
    A

    Greenhouses may be used to keep plants at a moderate temperature

    B

    The climate of France is unsuited to growing tropical plants outdoors.

    C

    Louis ⅩⅣ was a frequent and enthusiastic traveler to Africa and Asia


    正确答案： C,A
    解析：
    有原文可知，法国人修建“orangeries”（温室）是为了保护热带植物，所以A和B选项都是合理的推测，但这没有暗示Louis X IV亲自寻找过异域的水果，C选项排除。

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