单项选择题


A．idea
B．way
C．sign
D．group
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单项选择题
The microscope enables scientists to distinguish a(n) ______ number and variety of bacteri
A． selectedB. incredibleC. verifiableD. unavoidable
单项选择题
I promise to look ______ the matter as soon as I get back to the head office.
A．into
B．in
C．for
D．after
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