单项选择题

Man: Excuse me, madam. May I sit here Woman: ______

A．No, you can’t.
B．Yes, you may take the chair.
C．Of course not.
D．I’m afraid it’s taken.
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单项选择题
How is the 1996 discovery related to the possible existence of organisms on Mars
A．The meteorite containing organic compounds is part of Mars.
B．A Martian rock struck Earth about 11,000 years ago.
C．The organisms came back to life after the collision with Earth.
D．The inhabiting organisms appeared more than three billion years ago.
单项选择题
Children would play with fire until their hands were burnt away if______.
A．they were given no warning beforehand
B．they had never burnt themselves
C．they had no sense of pain
D．they were fearful of the fire
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