怎样理解第二部分划线句子的含意？（4分）

第1题：

下列哪个选项能够替换句子中的划线部分？In this work, our objective was to improve the carbon fiber performance significantly by utilizing very high molecular weight polymer so that high quality precursors can be produced.

A．producing high quality precursors

B．to produce high quality precursors

C．so that produce high quality precursors

D．produced high quality precursors

第2题：

指出下列句子划线部分的句子成分。 Bacons and eggs is nice for breakfast.

A．主语

B．表语

C．状语

D．定语

第3题：

请给下列英语句子中划线部分的语法功能属性判定正误 I enjoy writing in English. 谓语

第4题：

请给下列英语句子中划线部分的语法功能属性判定正误 The book on the desk is the present from Tom. 状语

第5题：

下列哪个选项能够替换句子中的划线部分？If organisms did not reproduce, life would quickly come to an end.

A．Without reproduction

B．Without reproducing

C．If not reproducing

D．If were not reproduced