单项选择题

Why sharks are useful for humans.*

A. Their tasty meat.
B. The principle of their defense system against disease.
G. Their solid skin.
D. The principle of their birth modes.
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单项选择题
How can the satellites catch the information about the soil
A．By turning the intensity of sunshine into maps.
B．By analyzing the recent weather report.
C．By capturing the microwave radiation from the soil.
D．By analyzing information provided by ground observation centers.
单项选择题
What is the future work planned to do
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 groun
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