We _______ work very quickly.


  1. A.
    don’t need
  2. B.
    needn’t to
  3. C.
    need not to
  4. D.
    don’t need to
D
試題分析: 此題重點考查動詞need的用法，它有兩個詞性，作為情態(tài)動詞時經常用在否定句中，并且后跟動詞原形；作為實義動詞時后可跟名詞，動詞不定式，動詞的現(xiàn)在分詞（表示被動意義）,其否定形式要借助助動詞do的形式.根據(jù)語境可知此句的含義是我們沒有必要干的那么快.根據(jù)語境和need的基本用法,可知D為正確答案.
考點：need的基本用法。
點評：此題的關鍵要看怎樣區(qū)分need的詞性.A和D中的need是行為動詞,但作為行為動詞need的基本用法是need to do sth,A的答案是不對的;B和C都是情態(tài)動詞,而need作為情態(tài)動詞其后只能跟動詞原形,故其也是錯誤的,故選D.因此區(qū)分need的詞性是解題的關鍵,但要分析題干的基本結構.
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1 

Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑戰(zhàn)) a world famous scientist!

Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸堿指示劑). They want it to take the place of litmus (石蕊) paper.

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British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.

But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.

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How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (莖) to get the pigments (色素) from them.

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"It's our first scientific journey, Huang said, "But it makes me want to try harder."

1.Whom did the three kids want to challenge?

A. Their chemistry teacher.

B. Their headmaster.

C. Robert Boyle

D. Thomas Edison

2.From the text, a red cabbage is a kind of ____.

A. plant　　B. animal　　C. paper　　D. liquid

3.What is widely used as the acid-base indicator now?

A. red cabbage              B. litmus paper

C. any plant                D. any flower 

4.The story mainly tells us ____.

A. how to make litmus paper

B. about the three kids' spirit

C. scientists were wrong

D. the kids are heroes

 

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