超低空微型遥感平台主要指飞行高度或滞留高度小于( )m，能装载轻型传感器的各种微型飞行器。

A．400

B．300

C．500

D．600

用所给形容词的适当形式填空。

1.  She is______ (old) of us all.

2.  English is ______ (important) than math.

3.  This hotel has the ______ (friendly) service in our town.

4.  My home is close to school, his home is ______ (close).

5.  All the movie theaters are good, but the Big Complex has ______  (comfortable) seats.

6.  Which do you like_______(well),this one or that one?

7.  Please speak English as______ (much) as possible.