单项选择题

Different cultures have different communication______.

A. styles
B. signals
C. designs
D. symbols
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单项选择题
The theory is of great importance ______ the hotter a body is, the more energy it radiates.
A. that
B. when
C. which
D. what
单项选择题
I couldn't understand why he pretended ______ in the bookstore.
A. to see me not
B. not to see me
C. not see me
D. to see not me
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