单项选择题

In studying social groups, sociologists often gain insight through the use of such devices as questionnaires.

A．access
B．credibility
C．publicity
D．understanding
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单项选择题
On the fourth of July 1776 the Declaration of Independence was adopted by the Continental Congress.
A．accepted
B．nominated
C．appointed
D．recommended
单项选择题
Very often bacteria or viruses inhabit the body without causing illness,a condition known as the carrier state .
A．surround
B．repel
C．occupy
D．devitalize
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