单项选择题

The Winfields are a quite conventional family（）

A．cheerful
B．humorous
C．ordinary
D．well-known

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单项选择题

Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice（）

A. are caused by
B. explain
C. derive from
D. constitute

单项选择题

The boy’s talent might have lain（）had it not been for his uncle’s encouragement.

A. extinguished
B. dormant
C. malignant
D. perishable

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