问题
单项选择题
对发动机进气道进行防冰时（）
A.需要接通发动机引气，且接通发动机防冰电门
B.不需要接通发动机引气，但要接通发动机防冰电门
C.需要接通APU引气，且接通发动机防冰电门
D.需要接通空调组件电门，且接通发动机防冰电门
答案
参考答案：B
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对发动机进气道进行防冰时（）
A.需要接通发动机引气，且接通发动机防冰电门
B.不需要接通发动机引气，但要接通发动机防冰电门
C.需要接通APU引气，且接通发动机防冰电门
D.需要接通空调组件电门，且接通发动机防冰电门
参考答案：B
Food is very important．Everyone needs to 21 well if he or she wants to have a strong body．Our minds also need a kind of food．This kind of food is 22 ．We begin to get knowledge even 23 we are very young．Small children are 24 in everything around them．They learn 25 while they are watching and listening．When they are getting older，they begin to 26 story—books，science books，anything they like．When they find something new，they love to ask questions and 27 to find out answers．What is the best 28 to get knowledge? If we learn by ourselves，we will get 29 knowledge．If we are 30 getting answers from others and do not ask why，we will never learn well．When we study in the right way．we will learn more and understand better．
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