The two Chinese scientists have made a wonderful discovery, which marks a major
题型：不详难度：来源：
The two Chinese scientists have made a wonderful discovery, which marks a major _______ in the basic research in the field.| A．reform | B．approach | C．boundary | D．breakthrough |
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答案
| D |
解析
试题分析：考查名词辨析：A. reform 改革，B. approach方式，方法，C. boundary边界，D. breakthrough突破，句意：这两个中国科学家做出重大发现，这标志着这个领域的重大突破。选D。 |
举一反三
While I_________that he is an excellent leader,I don’t think he can do a good job in this company because he is too careless.| A．reflect | B．recommend | C．acknowledge | D．urge |
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Lily was talking to our teacher about examination, when suddenly Tom _______.| A．cut off | B．cut out | C．cut up | D．cut in |
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We would appreciate it if customers don"t______ to leave their suggestions and expectations for our product.| A．hesitate | B．pretend | C．undertake | D．offer |
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It is true that at times the U.S.A. has experienced periods of _______ unemployment as well as labor shortages.
A. available B. acute
C. accessible D. ashamed |
With help from all parts of the country, the people in the flooded area managed to _______ that harsh winter.| A．get through | B．look through | C．come up | D．get out |
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