填空题

Wheels work well on flat surfaces, but are ______.

【参考答案】

much less efficient on uneven terrain
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单项选择题
A．She had not completed her assignment.B．She was unable to attend her psychology class.C．She felt embarrassed in class.D．Her presentation received a poor grade.
A．She had not completed her assignment.
B．She was unable to attend her psychology class.
C．She felt embarrassed in class.
D．Her presentation received a poor grade.
填空题
The result was Velcro, a product that was arguably more than ______years in the making, since that is how long the natural mechanism that inspired it took to evolve.
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