单项选择题

The Moon and most artificial satellites travel around the Earth in elliptical paths().

A.waves
B. orbits
C. voyages
D. flights

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单项选择题

Although research has shown that asparagus does contain many important nutrients, it is not, as it was once regarded, a panacea.()

A.an anomaly
B. a delicacy
C. a life-form
D. a cure-all

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