You should understand the math problem now, you have had it ________three times.

A. explaining　 B. to explain　　 　 C. explained　 D. explain

Does your cordless phone crackle, fade, or go dead when you move only a few feet from the base? If so, we recommend that you try a Techtalk cordless phone.

Techtalk cordless phones are the only ones with the patented Cellular 6 technology. The result is a phone with excellent clarity, range, and security.

Clarity: It's essential that you communicate efficiently and effectively. No static (静电), echo, or crackling will ever interfere with your conversations on a Techtalk phone.

Range: Techtalk provides up to four times the range of an ordinary cordless phone. It will go anywhere you need it throughout your home in your yard, even around the Block.

Security: Some cordless phones allow other cordless phone users to overhear your conversations. Not Techtalk. We guarantee complete privacy whenever you talk to your friends, family, or business associates.

You decide an ordinary cordless phone or Techtalk? Visit your favorite electronics store this month and take a Techtalk home for a 30-day trial. If you don't agree that it's superior to all other cordless phones, return it for a full refund.

1. This passage is _________.

　 A. a newspaper article　　 　　　　　　　　 B. an advertisement

　 C. a letter　　　　　　　 　　　　　　　　 D. a scientific introduction

2. What is Techtalk?

　 A. A kind of cordless phone.　　　　　 　　　

B. A company that used cordless phones.

　 C. A new technology that reduces static.　　　　　　　　　　　　　　　　　　　

D. A mobile phone with the patented Cellular 6 technology.

3. This month, you can ________.

A. get a reduced price on a Techtalk

B. try a Techtalk at home

C. get any cordless phone which you like

D. exchange a Techtalk phone for an ordinary phone

He got a lot of money these years,so he is very ______now.

Having received___________ training of the MS.Company, he was offered _______ important position in management.

　 A. the;an　　　 B. 不填;an　　 C. the;不填　　　 D. a;a

—Why do you turn back??

—Oh,the bridge ahead__________.?

A.is being repaired　　　　　　　 B.is repairing ?

C.is repaired　　　　　　　　　 D.is being repairing?

I lived with my brother this winter and didn’t have to pay rent. So I ________ save most of my salary.

A. could　 B. would　 C. was able to　 D. should

Modern man has cleared the forests for farmland and for wood, and has also carelessly burned them. More than that, though, he has also interfered （干涉） with the invisible bonds between the living things in the forests. There are many examples of this kind of destruction. The harmfulness of man’s interference can be seen in what happened many years ago in the forest of the Kaibab plateau （凯亚巴布高原） of northern Arizona. Man tried to improve on the natural web of forest life and destroyed it instead.

The Kaibab had a storybook forest of large sized pine, Douglas fir, white fir, blue and Engelmann spruce. In 1882 a visitor noted, "We, who ... have wandered through its forests and parks, have come to regard it as the most enchanting region it has ever been our privilege （特权） to visit. "This was also the living place of the Rocky Mountain mule deer. Indians hunted there every autumn to gather meat and skins. The forest also had mountain lions, timber wolves and bobcats that kept the deer from multiplying too rapidly.

Then ,in 1906,President Theodore Roosevelt made the Kaibab a national game preserve. Deer hunting was forbidden. Government hunters started killing off the deer’s enemies. In 25 years’ time,6,250 mountain lions, wolves and bobcats were killed. Before the program, there were about 4,000 deer in the Kaibab, by 1924,there were about 100,000.

The deer ate every leaf and twig they could reach. But there was not nearly enough food. Hunting of deer was permitted again. This caused a slight decrease in the deer herd （鹿群），but a far greater loss resulted from starvation （饥饿） and disease. Some 60 percent of the deer herd died in two winters. By 1930 the herd had dropped to 20,000 animals. By 1942 it was down to 8,000.

1．The destruction of the environment of the Kaibab resulted from .

A．turning the forest into cultivated land

B．interfering with natural cycle of forest life

C．forest fires caused by man’s carelessness

D．cutting the trees for building materials

2．"Engelmann spruce"（Para. 2） is most likely the name of .

A．a tree　 　 B．an animal 　 C．a mountain　 D．a game

3．The number of the deer in the Kaibab had increased enormously in years’ time.

A．25　　 　　 B．6　　　 　　 C．18　　 　　 D．12

4．Years later, large numbers of deer in the Kaibab died mainly because of .

A．the cold　　　 　　　　　　　 B．the organized kill

C．the shortage of food　 　　 D．the poor management

Tsinghua University, ____ in 1911,is home to a great number of outstanding figures.

A. found　　　　 B. founding　　 C. founded　　　 D. to be founded

It will at least take five months to repair the ship that was seriously __________by the hurricane.

　 A. destructed 　 B. ruined C. damaged 　 D. broken