单项选择题

A．Because he was never afraid of anything.
B．Because he was protected by a special medium.
C．Because he had enough experience.
D．Because it was his job.
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单项选择题
The passage centers on the controversy ________
A．between American and New Zealand biologists over genetic modification
B．as to whether the study of genetic modification should be continued
C．over the possible adverse effect of a GM bacterium on plants
D．about whether Elaine Ingham should be fired by her university
单项选择题
A．The man should work harder to improve his grades.B．The man will benefit from the effort he’’s put in.C．It serves the man right to get a poor grade.D．It was unfair of the teacher to give the man a C.
A．The man should work harder to improve his grades.
B．The man will benefit from the effort he’’s put in.
C．It serves the man right to get a poor grade.
D．It was unfair of the teacher to give the man a C.
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