单项选择题

________ I admit that there are problems, I don't think that they cannot be solved.

A．Unless
B．Until
C．As
D．While
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单项选择题
There is a ________ difference in meaning between the words surroundings and environment.
A．gentle
B．subtle
C．feeble
D．humble
单项选择题
If you want to set up a company, you must ________ with the regulations laid down by the authori- ties.
A．comply
B．adhere
C．confirm
D．accord
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