题目内容
（请给出正确答案）
Why is the Space Shuttle Columbia special？
A．Because it is not similar to the spaceships of the previous twenty years.
B．Because it has different designs and is able to return to earth and make further flights.
C．Because it can be used in a variety of ways now.
D．Because it can be used to establish colonies on earth.
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A、OR gate
B、AND gate
C、NOR gate
D、NAND gate
A．They will have time to study for it.
B．Afternoons are bad times for tests.
C．After it, they can study for other exams.
D．They can start planning for their semester break.
A．He thought experts were more needed there.
B．He wanted to have a good time there.
C．He was invited to work there.
D．He didn't like to stay in Shanghai any longer.
A．The food in Nanping.
B．The organization of the class.
C．The discussion in the class.
D．The co-operative spirit of the students.
A．He calls to cancel his reservation.
B．He calls to change his ticket.
C．He calls to check his ticket.
D．He calls to cancel his reservation and make another.
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