下面几个飞行阶段中，相对比较安全的是（）
A、进近
B、爬升
C、起飞
D、巡航
参考答案：D
．From his ________ voice on the phone I know everything is going under way.
A．satisfactory
B．satisfying
C．satisfied
D．satisfaction
The pencil is long.
The tree on the left is short.
The apple is in the house. 
The pencil is under the book.
It has two long ears.