单项选择题

All theories, however, are tentative and are ______ to criticism.

A. subject
B. immune
C. resistant
D. sensitive
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单项选择题
It's unwise to______between husband and wife.
A. intervene
B. interfere
C. interrupt
D. disturb
单项选择题
Teachers are not supposed to ______ methods that students must follow in their studies.
A. describe
B. prescribe
C. give
D. obey
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