【題目】It puzzles the scientists _____ some mammals produce their young _____ others lay eggs．

A. that; while B. what; while

C. that; as D. what; as

【答案】A

【解析】試題分析：本句中的it是形式主語 ，真正的主語是后面that引導(dǎo)的主語從句，that在主語從句中不充當(dāng)任何成分，只起引導(dǎo)作用。第二空的連詞while然而，表示上下文輕微的轉(zhuǎn)折關(guān)系。As不能表示上下文的轉(zhuǎn)折關(guān)系。句義：讓一些科學(xué)家困惑的是一些哺乳動物生出下一代，而另外一些卻產(chǎn)卵。故A正確。

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：

【題目】When I opened the door, I found my father sitting in his chair, completely __________ in the humorous stories he was reading.

A. absorbed B. losing C. attracted D. addicted

查看答案和解析>>

科目：高中英語 來源： 題型：

【題目】--May I use your dictionary？I'm stuck in the sentence.

--It's just on my desk ______.

A.Got itB.My pleasure

C.Help yourselfD.come to power

查看答案和解析>>

科目：高中英語 來源： 題型：

【題目】---Is everything settled?

---Not yet．_____ I approached the problem, I couldn’t find a solution．

A. Whatever B. However C. Whenever D. Wherever

查看答案和解析>>

科目：高中英語 來源： 題型：

【題目】The great success of this project has been largely ________ the support given by the 30 local businesspersons.

A. instead of B. thanks to

C. due to D. as a consequence

查看答案和解析>>

科目：高中英語 來源： 題型：

【題目】假設(shè)你是紅星中學(xué)高三（1）班學(xué)生李華。為迎接建國70周年，上個(gè)月學(xué)校組織了“祖國在我心中”主題知識競賽。請根據(jù)以下四幅圖的先后順序，介紹你和同學(xué)們參加活動的完整過程，并以“A Significant Event”為題，給校刊“英語角”投稿。詞數(shù)不少于60。

A Significant Event

_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

查看答案和解析>>

科目：高中英語 來源： 題型：

【題目】When you have western food, you should use knife and fork properly. The underlined word means “__________".

A. in a quick way

B. in the proper way

C. in a different way

D. in the usual way

查看答案和解析>>

科目：高中英語 來源： 題型：

【題目】At least twenty people were injured in the car accident, three children __________.

A. contained B. including C. were included D. included

查看答案和解析>>

科目：高中英語 來源： 題型：

【題目】What is the problem?

A. The woman doesn’t like orange juice.B. The man was looking for orange juice.

C. The man broke the container of juice.

查看答案和解析>>

同步練習(xí)冊答案