The two-seater car has a cute,round shape.Its front end looks like a friendly face:The “eyes” are headlights,the “nose” is a laser sensor and radar.

　　Another group of radars,lasers and cameras sits on top of the roof and gives the cars a 360-degree “view”.They are linked to computer software that can identify people,cars,road signs,and traffic lights,and thus tell the car to make turns and stops.

　　But the driverless car is only a “fair weather friend”,the DailyMail commented.

　　According to the MITTechnologyReview,the current driverless cars can’t react like a human driver.They can’t drive in heavy rain or snow.

　　Chris Urmson,director of the Google car team,said that this is because the detection technology is not yet good enough to separate certain objects from weather conditions.In the cars’ “eyes”,raindrops and snowflakes are the same as rocks,and cars stop for them.But if the manhole (下水道入口) ahead is uncovered,they drive over it without hesitation.Also,if a police officer waves at the side of the road to ask traffic to stop,the cars cannot understand him.

　　Despite all these problems,Urmson said driverless cars will “happen more quickly than people think”—perhaps as soon as in five years’ time.

　　But even at that time,driverless cars won’t be truly “driverless”.

　　In the US,driverless cars are only allowed on roads in certain states if someone sits in the driver’s seat.

【2016届高考英语二轮复习专项练习：Book7 7.2（新人教版）】相关文章：

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：训练1 短文改错（Ⅰ）（含解析）

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（17）附答案

★ 四川省2016届高考英语一轮复习课时作业（44） Module 2 The Renaissance 外研版选修8

★ 2014届高考英语一轮复习课时作业(四十一)选修7Module 5《Ethnic Culture》（外研版）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修8 unit2《Cloning》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (66)

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（10）附答案

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 8 A卷 Word版含解析

★ 四川省2016届高考英语一轮复习课时作业（38） Module 2 Highlights of My Senior Year 外研版选修8

★ 北京市2014高考英语一轮复习 练习手册（40）选修8 Unit 5 Meeting your ancestors（含解析）新人教版