单项选择题

Speaker2： Learning any language can be a challenge and we have to accept that making progress takes time and effort. So be__________.
A、happy
B、patient
C、useful
D、careful

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单项选择题

卫星通信是以空间轨道中运行的____作为中继站.
Satellite communication is based on _ running in space orbit.

A．地球站 Earth station
B．人造卫星 Satellite
C．天线 antenna
D．海岸电台 Coast station

不定项选择

企业购入的未使用固定资产无需计提折旧。

A．正确
B．错误