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What is this passage mainly about

A．Call on people to protect sharks.
B．Point out the living environment of sharks.
C．Explain why the sharks are dangerous.
D．An introduction to sharks.

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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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If you ______ Jerry Brown until recently, you'd think the photograph on the right was strange.

A．shouldn't contact
B．weren't to contact
C．didn't contact
D．hadn't contacted