单项选择题

A．everything
B．anything
C．nothing
D．something
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单项选择题
Scientists want to postpone the day when______.
A．all insects will be eliminated
B．all insecticides will be abandoned
C．super-bugs resistant to all poisons come out
D．scientists must invent new insecticides
单项选择题
A．IfB．AlthoughC．WhereasD．Because
A．If
B．Although
C．Whereas
D．Because
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