1.
　　A. To measure the performance of the driver assistance systems in real-world test situation.
　　B. To test whether driver assistance systems can the stop the car automatically in case of an emergency.
　　C. To test newly designed vehicles equipped with driver assistance technology.
　　D. To improve the success rate of driver assistance systems in real-world test situation.
　　2.
　　A. Incorrect braking.
　　B. Following cars in front of them too closely.
　　C. Making unexpected speed changes.
　　D. Sudden breaking down.
　　1. According to the news report, what’s the aim of the study
　　A. To measure the performance of the driver assistance systems in real-world test situation.
　　B. To test whether driver assistance systems can the stop the car automatically in case of an emergency.1.
　　A. To measure the performance of the driver assistance systems in real-world test situation.
　　B. To test whether driver assistance systems can the stop the car automatically in case of an emergency.
　　C. To test newly designed vehicles equipped with driver assistance technology.
　　D. To improve the success rate of driver assistance systems in real-world test situation.
　　2.
　　A. Incorrect braking.
　　B. Following cars in front of them too closely.
　　C. Making unexpected speed changes.
　　D. Sudden breaking down.
　　A new study has found that driver assistance（辅助） systems fail to perform some actions in real-world test situations. The American Automobile Association of America tested four vehicles（机动车） equipped with driver assistance technology. Such technology is designed to electronically help drivers with things like staying in their lane. The systems can also stop the car automatically（自动地） in case of an emergency（紧急情况）. The experiments aimed to recreate common driving situations to measure the performance of the assistance systems. All of the test models had systems designed to provide emergency stopping assistance. In addition, they were built to help keep vehicles within a lane and to back up speed control systems. The researchers reported repeated cases in which the test vehicle did not stay fully in its lane or moved back and forth within the lane. Other problems included the vehicles braking（刹车） incorrectly, following cars in front of them too closely and making unexpected speed changes. The study found that 90 percent of cases that required a driver to take over to avoid a crash happened because of a vehicle's inability to keep inside a lane. The AAA findings are the second tests to show that driver assist systems cannot deal with every situation in real-world driving, including some that are quite common. The Insurance Institute for Highway Safety released similar test results in August.