单项选择题

Why sharks are useful for humans

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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单项选择题
What will the man most probably do next
A．Fill out an application.
B．Go back to the university to get his ID.
C．Go to see his friend.
D．Take a written exam and an eye exam.
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 ground.
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