Scientists have achieved a major ___ in the search for a cure for cancer, ____ i

题型：不详难度：来源：

Scientists have achieved a major ___ in the search for a cure for cancer, ____ is good news for those who suffer from cancer.

A．breakthrough; what	B．breakdown; which
C．breakup; that	D．breakthrough; which

答案

D

解析

试题分析：考查名词和非限制性定语从句：句意：科学家在癌症疗法上已经有了重大发现，这对于癌症患者是好消息。第一空填A. 或D“breakthrough”突破，B. breakdown;破裂，C. breakup分手，第二空是非限制性定语从句，用which指代前面的句子，选D。
点评：词义辨析题在高考中有所涉及，每年的趋势不尽相同。对于词义辨析题目，首先可以从句意着手，看懂句意是解答此类题目的关键，其次四个选项的意思也要了如指掌。在非限定性定语从句中，关系词不能用that。