[填空题]Most of the motor vehicles use wheels.

[单项选择]
The Ford motor company’s abandonment of electric cars effectively signals the end of the road for the technology, analysts say.
General Motors and Honda ceased production of battery-powered cars in 1999, to focus on fuel cell and hybrid electric gasoline engines, which are more attractive to the consumer. Ford has now announced it will do the same.
Three years ago, the company introduced the Think City two-seater car and a golf cart called the THINK, or Think Neighbor. It hoped to sell 5,000 cars each year and 10,000 carts. But a lack of demand means only about 1,000 of the cars have been produced, and less than 1,700 carts have been sold so far in 2002.
"The bottom line is we don’t believe that this is the future of environment transport for the mass market," Tim Holmes of Ford Europe said on Friday. "We feel we have given electric our best shot. "
The Think City has a range of only abo
A. They have started to produce electric cars.
B. They have done extensive research on electric cars.
C. They have given up producing electric cars.
D. They have produced thousands of electric cars.

[填空题]Motor vehicles range from motorcycles to automobiles.

[填空题]The efficiency and speed of motor vehicles allow a nation’s agriculture to be established throughout the nation’s territory.

[单项选择]The road is designed for only motor vehicles, so once（）,bicycles are not allowed to go along it.
A. opens
B. having opened
C. opening
D. opened

[填空题]Why didn’t people begin to use unmanned vehicles in undersea exploration until recently
It is because of the ______.

[填空题]

The most important use of drifting bottles is to find ocean currents. When the position and direction of currents are known, ships can use the forward movement of a current or stay away from currents that would carry them off their course. Benjamin Franklin was one of the first to use bottles in the study of currents. He wondered why British mail ships needed a week or two longer than U.S. ships needed in order to cross the Atlantic Ocean. Franklin thought the Gulf Stream might explain this difference.
Franklin talked with U.S. captains. He found that they knew each turn of the Gulf Stream. They used the current in every possible way. From his talks with the U.S. sea captains, Franklin made his first map of the Gulf Stream. Then he checked his map by using sealed bottles. The map that he finally made is still used, with only a few changes, today.
 

Why are drifting bottles used To find（）.

[单项选择]A. Most of the vehicles don’t have any silencers.
B. The old town attracts more travellers to go there.
C. People like to turn the stereo up to maximum volume.
D. The traffic policemen increase whistles to control chaos.

[单项选择]It’s no secret that most busy American mothers use the TV set as a live-in babysitter. In some households the tube holds a child’s attention for the odd half hour or two while mom works on dinner; in others it is the child’s constant daytime companion. Is there any harm in this
Debate rages over the question, and periodically research is published showing that TV reduces attention span, makes children jumpy or inclines them to violence. In today’s cartoon David Horsey makes fun of the claims of "children’s TV", the special programming that supposedly uses entertainment to help youngsters to learn to read and take their first steps in the big, diverse world outside their family. What do children really get from this programming7
Horsey’s suspicion is that children’s programming chiefly turns kids into TV addicts, not into readers or happy mixers. The toddler in the cartoon, still at the age of pacifiers and stuffed animals, is held spellbound by the figure on the screen. What