3.C　词义推测题。由第四段可知,“祖父悖论”指的是如果时间旅行者的祖父被杀,时间旅行者则不可能出生。

　　4.B　观点态度题。从全文看,无论是引用的两位科学家的观点,还是H.G.Wells书中的事例,都说明了作者对时间旅行持有怀疑态度,最后一段更是明确表明了作者的态度,故选B项。unclear “不清晰的”;skeptical“怀疑的”;supportive “支持的”;unconcerned “不关心的”。

　　二、语法填空(共10小题;每小题1.5分,满分15分)

　　Waiting for a bus can be very 1.(annoy).Often you have been at the bus stop for half an hour,and the bus still doesn’t come.2.,people in Zhongshan,Guangdong don’t have to suffer this.It’s all because of a mobile APP,Zhongshan Real-time Buses.With the APP,people can find out the exact time a bus arrives and set an alarm to remind 3.(them) to go to the bus stop in time. 

　　Five Senior 1 students make the APP possible.At first,they just wanted to add or change bus lines to help make it much 4.(easy) for students at their school to take buses.But later,they wanted to make something that is 5.(benefit) to all the people of Zhongshan.6.(get) technical support,the team turned to the local public transportation group company.They carried out three surveys by collecting questionnaires 7. are completed by about 600 people in shopping malls and bus stops.“The work took up almost all of our spare time for four months,” said Su Yinan,16. 

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