单项选择题

Those instruments, such as the microscope and the telescope, which are essentially aids to the eye, have certain features ().

A. in common
B. by common
C. under common
D. among common

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单项选择题
Apart from these sciences there is philosophy, about () we will talk in detail later.

A. that
B. it
C. what
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Before Christmas all the shops are () with customers.

A. loaded
B. jammed
C. charged
D. mixed
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