单项选择题

I ______ a letter to an Internet service that distributes journalists' questions to more than 850 institutions.

A. assigned
B. attached
C. dispatched
D. detached
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单项选择题
Essentially, a theory is an abstract, symbolic representation of ______ reality.
A. what it is conceived
B. that is conceived
C. that is being conceived
D. what is conceived to be
单项选择题
Not until a monkey is several years old ______ to exhibit signs of independence from its mother.
A. it does begin
B. when it begins
C. does it begin
D. before it begins
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