If we_________ sunlight_________ a dry leaf with a piece of glass, it may start
题型：不详难度：来源：
If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning.| A．work; out | B．carry; out | C．focus; on | D．concentrate; on |
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答案
| C |
解析
| 短语辨析。Work out计算出，锻炼；carry out执行；focus…on…把…聚焦于…;concentrate…on…把…聚焦于…;结合句意可知C正确。句意：如果我们用意块镜子把阳光聚焦于一片干树叶，它很快就会开始燃烧。 |
举一反三
--- What should I do with my paper, Mr. Jason?
--- Well, what I have said about Peter’s _____ yours.| A．goes for | B．goes through | C．goes up | D．goes over |
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The parking rules in public places should be ______ strictly， otherwise you will get a ticket.
A. realized B, recognized C. consulted D. observed |
In order to help the police ，the witness described what he had seen very carefully not to ______ any detail.| A．act out | B．leave out | C．pick out | D．put out |
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The party was meant to be a surprise to everyone who would take part, but one of the organizers _______ the plan．| A．gave away | B．gave out | C．gave up | D．gave back |
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With the environment worsening, the government ______ people for more environment protection．| A．reacts to | B．appeals to | C．refers to | D．leads to |
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