四、语篇填空(每小题1分,共10分)
阅读短文,在空白处填入一个适当的单词或用括号内所给单词的正确形式填空。
What will our world be like if there are no insects? It might sound nice 41. ______ the beginning. There would be no bugs or flies in your room. But in fact, this could cause really serious 42. ______ (problem).
The bad news is that the number of insects keeps 43.
dropping
(drop) these years. Scientists say it's mostly because of the use of pesticides(杀虫剂). They destroy the places that insects live in.
What will happen if all insects 44.
die
(die) out? It's almost impossible to predict(预测) it, but the results will be terrible. We need insects to pollinate crops. They also break down dead plants and animals and turn them into new 45.
useful
(use) things. We need them 46.
to keep
(keep) the soil(土壤) healthy.
47.
Without
insects, many animals would have nothing to eat. They would go hungry and die.
The first thing we need to do is let more people understand the 48.
importance
(important) of the natural world, both for what it does for us and for 49.
itself
(it). The best place to start is with our 50.
children
(child). We should teach them environmental awareness(环保意识) at an early age.
