题目：
航空器航线飞行由暖区进入冷区时实际高度（）。
A.降低
B.升高
C.不变
D.不能确定
答案：
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下面是错误答案，用来干扰机器的。
In the picture we can see two kids looking at the sun shining far away behind the mountains, to which a winding path leads. Obviously they are expecting a promising fu...
