【正文】 2011年6月大學(xué)英語四級全真預(yù)測試卷及答案　　Part I Writing (30 minutes)　　Directions: For this part, you are allowed 30 minutes to write a letter. You should write at least 120 words following the outline given below in Chinese:　　給你的外國朋友寫一封信，告訴他(她)你已經(jīng)被美國的一所大學(xué)錄取，但你苦惱的是自己的聽力和口語水平不夠，你想尋求他(她)對于如何提高聽力和口語的建議?！　art II Reading Comprehension (skimming and Scanning) (15 minutes)　　Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1.　　For questions 17, mark　　Y (for YES) if the statement agrees with the information given in the passage?！　 (for NO) if the statement contradicts the information given in the passage?！　G (for NOT GIVEN) if the information is not given in the passage.　　For questions 810, plete the sentences with the information given in the passage.　　Robot Cars to Do Battle in Desert Race　　When 15 petitors lined up in Nevada last year for the . Defense Department39。s first milliondollar robot race, hopes were high. The challenge: to drive a vehicle without a human driver or remote control some 150 miles (241 kilometers) through the Mojave Desert.　　But those hopes quickly went up in a cloud of dust as most robots barely managed to get off the starting line. The best performer, a modified Humvee built by engineers at Pennsylvania39。s Carnegie Mellon University, traveled 7 miles (11 kilometers) before breaking down.　　To robot devotees(熱愛者), however, it was a miinor hiccup.　　No surprise, then, that 43 teams showed up to try out for this year39。s race, dubbed(被稱作) the Grand Challenge. For the past week, teams ranging from garage enthusiasts to wellfunded university engineers have been finetuning their machines at qualifying rounds here at the California Speedway in Fontana, California. (Watch the robots in action in our exclusive video.)　　Twentythree finalists were announced Thursday for Saturday39。s Grand Challenge. The 175mile (282kilometer) course starts and finishes in Primm, Nevada.　　The race promises to be even tougher than last year39。s run. But 18 months is an eternity in the robotics world, and the technology has vastly improved.Organizers believe several teams have a real shot of finishing the race in less than ten hours to earn the grand prize of two million . dollars.When the first team out of the chute(斜道)—Mojavaton, a small team out of Colorado—made it successfully around the () qualification course, I knew right there and then that we had something special, said Ron Kurjanowicz, the chief of staff for the Pentagon39。s Defense Advanced Research Projects Agency (DARPA), which is sponsoring the race.　　Unknown Course　　The aim of the Grand Challenge, Defense Department officials say, is to spur development of autonomous ground vehicles that can operate in dangerous environments, such as war zones, keeping soldiers out of harm39。s way.　　A . Congress mandate(訓(xùn)令)requires that onethird of military ground vehicles drive themselves by 2015, but the technology to meet that mandate does not yet exist.　　So the government looked to enterprising teams to develop the technology for driverless vehicles, sweetening its offer with the twomilliondollar purse.　　None of the 23 teams knows what lies ahead for this year39。s race. DARPA won39。t reveal the exact route until two hours before the start of the race on Saturday.　　But the obstacles on the Fontana qualification courseincluding a steel—enforced tunnel that wipes out a vehicle39。s global positioning system—are made to resemble the rugged, reallife conditions that the vehicles will have to navigate.　　The vehicles use sensors such as lasers, cameras, and radar to help them avoid obstacles such as rocks and cliffs. The puter39。s brain has to figure out how to resolve unexpected conflicts, like a boulder sitting in the middle of the road.　　Think about all the decisions that you and I have to make when we drive from our house to the store, Kurjanowicz said. These vehicles have to do the same thing, without a driver.　　Among the top contenders in Saturday39。s race is TerraMax, a massive truck originally built by the Wisconsinbased Oshkosh Truck Corporation for the . Marine corps.　　In last year39。s race, TerraMax managed to go only miles (2 kilometers). Team leader Gary Schmiedel expects to do much better this year. He pointed to the new allwheel steering feature on the truck as an important addition.　　We can move this large, 15ton ( ton) payload vehicle in a turn that39。s equivalent to that of a Humvee, he said.　　Ghostrider　　The resources of teams like TerraMax or Carnegie Mellon University, which has two vehicles in the race this year, are a far cry from those of some of the other petitors, including inventors, electricians, and even a high school team.　　One entry, from a Southern California team of engineers, racers, and hotrodders, is called It Came From the Garage. It has a beer keg(小桶)stuck on the back and an onoff switch that says brain.　　Most of the schools and organizations we39。re up against are just accessorizing conventional vehicles, said team leader Chris . Pedersen, a former actor. Our [vehicle] is a custombuilt, 21stcentury hot rod... plete with hood scoop and exhaust ing off the side.　　Anthony Levandowski, a robotics builder from Berkeley, California, is back with Ghostrider, the only motorcycle robot in the qualifications. Studded with sensors and puters, it toppled (翻倒)over after 3 feet (1 meter) in last year39。s race.　　Levandowski, who had to postpone his graduate studies when he couldn39。t find a faculty advisor who believed it would be possible to build the motorcycle robot, says his vehicle has some distinct advantages.　　We39。re smaller and go a lot more places, he said while tinkering with the robot before another trial run. We39。re also a lot less expe nsive. This bike costs as much as a tire or a wheel of some of these other guys39。 machines.　　Smart MoneyNeither Ghostrider nor It Came From the Ga