单项选择题

In 1970, if the cost to produce one widget was $0.07, what would have been the total cost to produce the number of widgets sold during that year？（）

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问答题

Select the sentence within the paragraph that describes why sales of Edison’s concrete furniture turned out to be unsuccessful.

多项选择题

Long considered one of the most beautiful of the planets, Saturn has rings that scientists believe (i) the wreckage of scattered moons, but that is partially just (ii) as, so far, no spaceship has been able to bring any ring material specimens back to Earth.（）

A. consist of
B. revolve around
C. resulted in
D. experimentation
E. speculation
F. vacillation

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