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A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.
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单项选择题
When a college tries to be all things to all people’’ ( Line 1, Para. 1 ) it aims to ________.
A．satisfy the needs of all kinds of students simultaneously
B．focus on training students in various skills
C．encourage students to take as many courses as possible
D．make learning serve academic rather than productive ends
单项选择题
A．About 45 million.B．About 50 million.C．About 5.4 million.D．About 4.5 million.
A．About 45 million.
B．About 50 million.
C．About 5.4 million.
D．About 4.5 million.
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