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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填空题
A．combinationsB．correctionsC．co-ordinationsD．collections
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.
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