（上海卷38）. Wind power is an ancient source of energy we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |
相关试题
His efforts to raise money for his program were ______ because, no one showed any intention to take a cent out of their pockets.
| A．in place | B．in sight | C．in effect | D．in vain |
You’d sound a lot more polite if you make a request ______ a question. 
| A．in search of | B．in the form of |
C．in need of | D．in the direction of |
The questionnaire takes ______ ten to fifteen minutes to complete and can be used along with the assessment interview.
| A．mainly | B．punctually | C．approximately | D．precisely |
As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
| A．primary | B．alternative | C．instant | D．unique |
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