单项选择题

A．Accurate communication is of utmost importance.
B．Pilots should be able to speak several foreign languages.
C．Air controllers should keep a close watch on the weather.
D．Cooperation between pilots and air controllers is essential.
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单项选择题
Two Australian billionaires have been placed on the waiting list for entering space as private passengers.
A．Y
B．N
C．NG
单项选择题
A．Cathy likes having a picnic on a sunny day.B．Alan is expecting a gentle breeze to cool himself off.C．They haven’’t had much sunshine recently.D．Much to their surprise, bad weather is setting in.
A．Cathy likes having a picnic on a sunny day.
B．Alan is expecting a gentle breeze to cool himself off.
C．They haven’’t had much sunshine recently.
D．Much to their surprise, bad weather is setting in.
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