The number of insects has fallen by 45% in the past 35 years. This could be dangerous for humans. A report on this has been published in the Science. It says the human population has doubled since 1980. The number of insects has nearly halved. One of the biggest reasons is deforestation. Land is disappearing because of new cities and farms. Another reason is global warming. In the UK, the number of beetles, butterflies, bees and wasps has fallen by up to 60%. Many countries are worried about the fall in number of bees and butterflies. 

    Scientists say fewer insects will make many problems for humans. One of the biggest dangers is that there will be fewer insects to pollinate flowers. Farmers will have problems growing food. The author of the report said falling numbers of insects could also lead to more disease. He said rats and mice would have less food so they will move to cities and bring diseases with them. A professor said we must stop more insects from dying. He said scientists must understand, "what species are winning and losing in the fight for survival". This will help us to protect the "helpful" insects. 

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1.What does the underlined word “insects” mean in Chinese?

A 昆虫.

B 蜻蜓.

C 蝴蝶.

D 毛毛虫.

解析：选A。A 语义理解题。根据文章可知讲的不是某一种昆虫，而是昆虫的总称，故选A。

2.Which has NOT fallen by up to 60% in the UK?

A Beetle.

B Bees.

C Wasps.

D Horses.

解析：选D。D 综合理解题。根据第1段倒数第2句In the UK, the number of beetles, butterflies, bees and wasps has fallen by up to 60%.可知，故选D。

3.Which is RIGHT according to the passage?

A The number of insects has doubled since 1980.

B Land is disappearing because of more insects.

C Fewer insects cause global warming.

D Helpful insects are the friends of human.

解析：选D。D 内容理解题。根据文中最后一句This will help us to protect the "helpful" insects. 可知，故选D。

4.Which is NOT the problem caused by fewer insects?

A Pollinating flowers.

B Growing food.

C Leading to more disease.

D Creating a better world.

解析：选D。D 内容理解题。文章并未提到昆虫减少有利于创造一个更好的世界，故选D。

5.The fewer insects, the__________human will be.

A happier

B safer

C more dangerous

D better

解析：选C。C 综合理解题。根据文章第一段第一、二句The number of insects has fallen by 45% in the past 35 years. This could be dangerous for humans.可知，故选C。