单项选择题

In the last few minutes the conversation has become seemingly ______ as if the discussion were of some minor domestic matte r and not survival itself.

A．crucial
B．central
C．casual
D．causal
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单项选择题
A ______ of soap and two brightly colored towels were left beside the bath, the women smiled politely at Nicole and withdrew carefully form the room.
A．loaf
B．bar
C．stick
D．block
单项选择题
Scientists are ______ certain that there is a cancer-inhibiting agent in the blood of the shark.
A．dubiously
B．virtually
C．queerly
D．randomly
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