单项选择题

Because of modem technology, some mountain areas are not isolated ______ the outside world.
A) with C) away
B) from D) off
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单项选择题
The new machines must ______strictly according to the instructions.
A. be operated B. be operating C. operate D. operated
单项选择题
______ that the left side of the human brain is responsible for logic.
A．It generally is believed
B．It is generally believed
C．It is believed generally
D．Generally it is believed
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