单项选择题

A probable goal of the agricultural project is to

A．reduce pollution in reserve farmlands.
B．obtain the United Nations' cooperation.
C．learn how local farms are operated.
D．import new breeds of farm animals.

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单项选择题

The identified cause of the problem is

A．the rapidity with which larvae mature.
B．a common practice of the shipping industry..
C．a century-old species.
D．the worldwide movement of ocean currents.

单项选择题

Oceanographers are concerned because

A．their knowledge of this phenomenon is limited.
B．they believe the oceans are dying.
C．they fear an invasion from outer space.
D．they have identified thousands of alien webs.