单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

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．4 weeks.B．6 weeks.C．8 weeks.D．10 weeks.
A．4 weeks.
B．6 weeks.
C．8 weeks.
D．10 weeks.
单项选择题
A．By good sense of water waves made by quarries.B．By good sense of smell and electrical and magnetic power.C．By good sense of light.D．By good sense of blood.
A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical and magnetic power.
C．By good sense of light.
D．By good sense of blood.
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