单项选择题

The doctor felt John's arm to ______ if the bone was broken;

A．work out
B．find out
C．look at
D．see out

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单项选择题Which of the following is TRUE（）

A．The positioning precision of the voice system is better than that of GPS.
B．The positioning precision of the messaging system is better than that of GPS.
C．The positioning precision of the voice system is better than that of the messaging system.
D．The positioning precision of GPS is better than that of the voice system.

单项选择题What can we say about the new global satellite communications systems（）

A．They are widely used.
B．They are very helpful.
C．They are costly.
D．Both A andB.