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【单选题】
驾驶舱风挡由（ ）层非结构层，（ ）层结构层，（ ）层加热层和（ ）层空层组成。
A.
1，2，1，2
B.
2，1，2，1
C.
1，1，1，2
D.
2，2，1，2
参考答案：
参考解析：
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举一反三
【单选题】The war had begun, and George had joined the air force. He wanted to be a pilot and after some months he managed to get to the air force training school, where they taught pilots to fly. There, the fi...
A.
to fight the war
B.
to fly
C.
to he a pilot
D.
to be a passenger