题目内容：

    Insects could disappear within a century at current rate of decline, says Global Review.

The world’ s insects are moving quickly down the path to dying out, indicating a disastrous collapse（崩溃）of nature’ s ecosystems is likely to happen, according to the first global scientific review. More than 40% of insect species are declining and a third are endangered, the analysis found. The rate of extinction（灭绝）is eight times faster than that of mammals, birds and reptiles.

“It should be of huge concern to all of us, for insects are at the heart of every food web—they pollinate（授粉） the large majority of plant species, keep the soil healthy, recycle nutrients, control pests, and much more. Love them or hate them, we humans cannot survive without insects,” said Prof Dave Goulson at the University of Sussex in the UK.

The analysis, published in the journal Biological Conservation, says intensive agriculture is the main driver of the declines, particularly the heavy use of pesticides（杀虫剂）. Urbanisation and climate change are also significant factors.

One of the biggest impacts of insect loss is on the many birds, reptiles, amphibians and fish that eat insects. A small number of adaptable species are increasing in number, but not nearly enough to outweigh the big losses.

Matt Shardlow, at the conservation charity Buglife, said, “It is alarming to see this collation（整理） of evidence that shows the state of the world’ s insect populations. It is increasingly obvious that the planet’ s ecology is breaking and there is a need for an intense and global effort to stop and reverse（反转）these terrible trends.”

1.What did Prof Dave stress in his speech?

A.Insects are vital to food webs.

B.Not all people love insects.

C.Scientists are concerned about insect loss.

D.Humans need certain conditions for survival.

2.Which of the following is most influenced by insect loss?

A.Animals that feed on insects. B.Adaptable animal species.

C.Pests that are used to pesticides. D.Crops produced by intensive agriculture.

3.How did Matt Shardlow sound when talking about the state of insect loss?

A.Relaxed. B.Uncaring.

C.Humorous. D.Worried.

4.What is the best title for the text?

A.The extinction rate of insects gets slowed down.

B.The failure of nature’ s ecosystems can be avoided.

C.Sharp drops in insect numbers endanger ecosystems.

D.Insect extinction harms the diversity of animal species.