题目内容

 

1.__________ (eat) too many sweets is bad for our teeth.

2.Tom wants (be) a good teacher when he grows up.

3.My sister often (fly) a kite in the park.

4.Liu Tao, __________ (not be) shy! You can do it well.

5.The twins don’t learn Maths hard, so they __________ (not do) well in it.

 

1.Eating

2.to be

3.flies

4.don’t be

5.don’t do

【解析】

试题分析:

1.吃糖过多对你的牙齿有害。根据语境可知,这是动名词短语作主语,表示做具体的某一件事。在句首大写第一个字母,故应填:Eating。

2.为:汤姆长大后想成为一名好老师。want后可接名词或动词ing形式。根据语境可知,这是want to do sth的用法,故应填:to be。

3.为:我妹妹经常在公园放风筝。根据语境,这里指的是一个经常的习惯性的动作,应用一般现在时。由于主语是第三人称单数,根据主谓一致原则,应用动词第三人称单数形式,故应填:flies。

4.为:刘涛,别害羞,你会做好的。根据语境,这里表示安慰、鼓励的语气,应用祈使句。结合所给词汇可知这是否定的祈使句,故应填:don’t be。

5.为:这对孪生姐妹数学不努力,因此他们学得不好。根据语境可知,这里表示的是现在的情况,应用一般现在时,主语是非第三人称单数,结合申根国词汇可知应填:don’t do。

考点:单词填空。

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A new study finds that plants communicate with one another to warn of danger.

We often consider plants as the furniture of the natural world. They don’t move; they don’t make sounds;they don’t seem to act on anything. But as is often the case, plants talk to each other all the time. And the language is a chemical (化学物质).

Over the years, scientists have reported that different types of plants, from trees to tomatoes, give out chemicals into the air to help neighbouring plants. These chemical warnings can spread information about one plant’s disease or infestation (虫害),so other plants can protect themselves. But how plants receive and act on the information exactly is still mysterious (神秘的).

In this week’s Science Magazine, researchers in Japan offered some explanations. They have found out one chemical message and traced it all the way from beginning to end.

The scientists looked at tomato plants infested by a common pest (害虫). To start out,they grew plants in two separate plastic spaces connected by a tube (管子). One plant was infested and placed upwind and the other was uninfested and placed downwind. The downwind plants were later exposed (暴露的)to the pest. The results showed that plants near sick neighbours before were able to protect themselves better against the pest.

They found one chemical appeared more often in the exposed plants. The chemical is called HexVic. The scientists discovered where HexVic came from, and put it over healthy plants. Those plants were then able to produce HexVic. Researchers made sure that uninfested plants could fight off bugs and diseases. How do they know when to protect themselves? They are warned first by their friendly plant neighbours.

It is not a simple story , and it may be happening in many other plants besides tomatoes. It may also be happening with more chemical signals that are still unknown to us. In a word, we know that plants not only communicate, but also look out for one another.

1.The underlined word “traced” in the fourth paragraph probably means _______here.

A. reported B. followed C. doubted D. developed

2.For scientists, which are the right steps to watch tomato plants infested by a pest?

① Place the infested plant upwind.

② Place the uninfested plant downwind.

③ Expose the downwind plants to the pest.

④ Grow plants in two separate plastic spaces connected by a tube.

A. ③①②④ B. ①④③②

C. ④①②③ D. ④②①③

3.You can put the sentence “The researchers also studied leaves from exposed plants and unexposed plants. " at the beginning of Paragraph ____.

A. 3 B. 4 C. 5 D. 6

4.Which of the following can be the best title of this passage?

A. Communicating Plants and Terrible Diseases

B. Talking Plants and Friendly Warnings

C. Protecting Plants and Clear Information

D. Growing Plants and Mysterious Chemicals

 

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