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.
单项选择题
A．They had plenty of time to get to the forest.B．They kept their boat in the centre of the river.C．The river carried their boat along quite quickly.D．They had pushed off the bank.
A．They had plenty of time to get to the forest.
B．They kept their boat in the centre of the river.
C．The river carried their boat along quite quickly.
D．They had pushed off the bank.
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