一With reasonable care and skill．You should expect a proper standard of workmanship(工艺)．A new house should have straight walls and the roof must not leak．
一Within a reasonable time．A shop should not take three months to repair your TV．You can always agree upon a completion time with the supplier of the service．
You，the customer，must pay：
一A reasonable charge for a service，where no price has been fixed in advance. A trader can not expect a large payment for a small job．
64．The underlined word these in Paragraph 2 refers to“_______．
A．the services
B．the workers
C．the goods
D．the rules
65．What should the supplier do when offering a service?
A．He should determine the completion time himself
B．He should provide flee repairs within three months．
C．He should make sure the service meets proper standards．
D．He should reach an agreement on the payment with his workers．
66．The passage is trying to_________．
A．ask the customer to buy goods and services of high quality．
B．advise the buyer how to pay a reasonable price for a service
C．tell the customer what rights he has once he pays for something
D．warn the seller what he sells must meet the buyer's requirements．
D
Thirteen vehicles fined up last March to race across the Mojave Desert，seeking a million in prize money．To win，they had to finish the 142-rnile race in less than 10 hours．Teams and watchers knew there might be no winner at all，because these vehicles were missing a key part—drivers．
DAKPA，the Defense Advanced Research Projects Agency，organized the race as part of a push to develop robotic vehicles for future battlefields．But the Grand Challenge，as It was called, just proved how difficult it is to get a car to speed across an unfamiliar desert without human guidance．One had its brake lock up in the starting area．Another began by throwing itself onto a wall．Another got tied up by bushes near the road after 1.9 miles．
One turned upside down．One took off in entirely the wrong direction and had to be disabled by remote(远离的)control．One went a little more than a mile and rushed into a fence；another managed to go for six miles but stuck on a rock．The“winner," if there was any．reached 7．8 miles before it ran into a long．narrow hole，and the front wheels caught on fire．
“You get a lot of respect for natural abilities of the living things ,"says Reinhold Behringer，who helped design two of the car--size vehicles for a company called Sci-Autonics．“Even ants(蚂蚁)can do all these tasks effortlessly．It s very hard for us to put these abilities into our machines. The robotic vehicles．though with necessary modem equipment such as advanced computers and GPS guidance，had trouble figuring out fast enough the blocks ahead that a two—year—old human recognizes immediately．Sure，that very young child，who has just only learned to walk，may not think to wipe apple juice off her face，but she already knows that when there s a cookie in