单项选择题

Why American scientists are 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.

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单项选择题

Which is not mentioned in the passage as an aspect that farming activities are damaging

A．Soil.
B．Human population.
C．Forest.
D．Water.

单项选择题

What is the purpose of the conversation

A．To help the woman make a purchase.
B．To request the woman's identification.
C．To show the woman for a course at City College.
D．To register the woman how to make out a check.