单项选择题
General acceptance of 3-D films may prove hard to come by as the experience of three decades ago indicated.
- A．obtain
B．explain
C．understand
D．discerm
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相关考题
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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
Many politicians find that they can no longer afford the luxury of a personal chauffeur.
A．valet
B．driver
C．secretary
D．servant
