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．Run later that day.B．Consult a doctor.C．Let her examine his knee.D．Give his knee a rest.
A．Run later that day.
B．Consult a doctor.
C．Let her examine his knee.
D．Give his knee a rest.
填空题
The skeletons of brittle stars contain thousands of tiny eyes, which enable them to ______.
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