题目

请为下列五位同学找到他们需要的网站。41.Betty wants to get some pictures of Beijing.42.Tony wants to know something about basketball.43.Daming wants to make a foreign pen friend and learn English.44.Lingling wants to buy a pair of shoes on the Internet.45.Sally wants to download some music.A．www.NBA.com. It has the latest news about basketball players.B．www.24en.com. You can find some friends and talk with them in English.C．www.ebay.com. A really big shop online.You can buy anything you need.D．www.Beijingphoto.com. Pictures about some places in Beijing.E．www.music.co现代社会汽车大量增加，发生交通事故的一个重要原因是遇到意外情况时车不能立即停止，驾驶员从发现前方道路有异常情况到立即刹车制动需要一段时间，这段时间叫反应时间，在这段时间里汽车通过的距离叫反应距离．从操纵制动器，到汽车完全停止，汽车又前进一段距离，这段距离叫制动距离．若汽车在平直高速公路上以120km/h的速度匀速行驶．问：（1）反应距离是多少？（2）为避免与前车相撞，在正常行驶时驾驶员必须使自己驾驶的汽车与前面车辆保持一定的距离，这一距离至少要大于多少米？（3）请你给司机朋友提一条安全行驶的建议．速度v/km•h﹣1反应时间t/s制动距离s/m50O．491360O．502080O．51341000.5254120O．5485