单项选择题

The inertial platform is mainly used

A．to prevent the ship or plane from moving off course.
B．to send information from the ground control unit.
C．to maintain the speed of the ship or plane.
D．to prevent a change in the systems orientation.
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单项选择题
Which of the following assumptions about early humans is expressed in the passage
A．They probably had extensive knowledge of plants.
B．They thought there was no need to cultivate crops.
C．They did not enjoy the study of botany.
D．They placed great importance on the ownership of property.
单项选择题
What does the comment This is logical. in line 5 of the first paragraph (underlined) mean
A．There is no clear way to determine the extent of our ancestor's knowledge of plants.
B．It is not surprising that early humans had a detailed knowledge of plants.
C．It is reasonable to assume that our ancestors behaved very much like people in preindustrial societies.
D．Human knowledge of plants is well organized and very detailed.
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