1.The e-commerce_____ production and consumption, and is promoting the development of the service sector.
A. has influenced B. influenced C. is influencing D. is influenced
【答案】A
【解析】
【详解】考查现在完成时。句意：电子商务已经影响了生产和消费，并且正在促进服务业的发展。结合句意可知，电子商务“影响生产和消费”的动作已经发生，故用现在完成时，主语The e-commerce是不可数名词，故用has influenced。故选A项。
2.Past winners of the Nobel Prize in physics, _____ has now been awarded 210 times, have been honored for their important discoveries.
A. who B. what C. that D. which
【答案】D
【解析】
【详解】考查非限定性定语从句。句意：诺贝尔物理奖过去的获奖者，因为他们的重大发现被给予荣誉称号，该奖项已经颁发了210次。分析句子可知，此处是非限定性定语从句，先行词the Nobel Prize in physics在从句_____ has now been awarded 210 times中充当主语，故用关系代词，又非限中不能使用that，故用which。故选D项。
