单项选择题

A．Acquire information from satellites more efficiently.
B．To realize full coverage of area the satellite passes over.
C．Building more ground observation centers.
D．Compare satellites information with those from ground.
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单项选择题
A．They want to change the way English is taught.B．They learn English to find well-paid jobs.C．They want to have an up-to-date knowledge of English.D．They know clearly what they want to learn.
A．They want to change the way English is taught.
B．They learn English to find well-paid jobs.
C．They want to have an up-to-date knowledge of English.
D．They know clearly what they want to learn.
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