Bats are the only mammals(哺乳动物) which can fly properly. Other flying mammals have wings of

Bats are the only mammals(哺乳动物) which can fly properly. Other flying mammals have wings of thin skin which cover their sides between their front and back legs. They can only fly from tree to tree, but they cannot change direction when they want to.
All bats fly at night and most of them hunt for flying insects(昆虫), such as bees. The mon bat finds its food by making a constant noise that the human ear cannot hear. The bat listens for echoes(回声) of the noise as it bounces(反射) off the insects showing the bat their position.
The Fruit bat feeds on many different kinds of fruit. It does not use echoes but instead has very large, special eyes to see even in low light. The largest Fruit bat has a wing length of 0.75 meters. The Vampire bat drinks the blood of large mammals, and a few bats catch fish, birds and even other bats.
【小题1】 Some flying mammals are not real flyers because     .A．they do not have wingsB．their wings are too thinC．they have skin between their legsD．they cannot turn around in the air【小题2】 When mon bats hunt for food they     .A．use echoes to kill the insectsB．make a noise to draw insects to themC．produce a sound and listen to the echoesD．listen noise made by the insects【小题3】 Unlike other bats, the Fruit bat     .A．can see very wellB．eats fruit and fishC．has very long wingsD．has excellent hearings【小题4】The word it in the second paragraph refers to     _.A．the batB．the echoC．the noiseD．the insectD【小题1】C【小题1】A【小题1】C