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Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. 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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A．forB．inC．withD．on

A．for
B．in
C．with
D．on

单项选择题

Why are American scientists developing these maps

A．To estimate the extreme weather.
B．To develop the satellite technology.
C．To improve agricultural output.
D．To learn how to change information to maps more efficiently.

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. What is this passage mainly about 您的浏览器不支持 audio 元素。

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. What is this passage mainly about