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3. Mr. Nagley is ateacher. He teaches (in/at/from)September (to/in/at) June. (At/From/In) the summer, he travelsand does volunteer work.

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4. My friend Stuartwas born (on/in/at) December 31. In otherwords, he was born (in/on/at) NewYear's Eve. Naturally he has a big party every year (in/at/on)his birthday!

5. I am expectingan important phone call (in/to/at) 1:00p.m. I can meet you later (on/in/at)the afternoon.

高度分为绝对高度、相对高度、真实高度和（）

A. 参照高度
B. 起飞高度
C. 标准高度
D. 标准气压高度

__________是一种测量、显示飞机航向角、仰俯角和滚转角的飞行仪表。

A. 导航系统
B. VOR
C. 航向姿态系统
D. 无线电系统