After visiting China, most of the foreign friends said they would never forget the time they had spent in China. A．that B．what C．when D．at which 题目和参考答案——青夏教育精英家教网—

题目内容

After visiting China, most of the foreign friends said they would never forget the time they had spent in China.

A．that B．what C．when D．at which

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—Liu Xiang has successfully undergone the surgery in a US hospital.

—But for his foot injury, he________ another gold medal in the Beijing Olympic Games.

A．must have won B．would have won C．would win D．had won

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A．moved B．moving C．to move D．being moved

After the bell rings, which indicates the ending of the exam, you stay where you are until all your papers are collected.

A．shall B．would C．will D．can

was in this research I collected sufficient data for my report.

A．It；which B．What；where C．It；that D．That；where

Can you walk in a straight line? The question is much more difficult to answer than you think. Believe it or not, your eyes and ears help you to walk!

A recent experiment held in Japan shows that it is almost impossible for people to walk exactly straight for 60 meters.

　　The Tokyo University of Agriculture and Technology asked 20 healthy men to walk as straight as possible for 60 meters at normal speed.

Each man had to wear socks soaked with red ink and walk on white paper fixed flat to the floor. The footprints showed that all walked in a winding rather than a straight line.

Researchers found that people readjust their direction of walking regularly. The amount of meandering（曲折前行） differed from subject to subject.

This suggests that none of us can walk in a strictly straight line. Rather, we meander, mainly due to a slight structural or functional imbalance of our legs. So steps by the left and right legs of a person are different.

As a result, although we may start walking in a straight line, several steps afterwards we have changed direction. Eyesight helps us to correct the direction of walking and leads us to the target.

Your ears also help you walk. After turning around a lot with your eyes closed, you can hardly stand still or walk straight. It's all because your ears are still spinning and can't help you keep your balance. Inside your inner ear is a structure containing liquids. Inside your ears are many minute hair-like structures that move around as the liquid flows.

When you spin the liquid inside also spins. The difference is that when you stop, the liquid continues to spin for a while. Dizziness（眩晕） is the result.

　　For the moment, although your eyesight tells you to walk in a straight line your brain listens to your spinning ears, thus you don't walk in a straight line!

1．When you walk for 60 meters, you .

A．can walk straight without effort

B．meander at first, and in while walk in a straight line

C．can’t walk exactly straight at any time

D．can almost not cover the distance in a straight line

2．Why most time can we only wind our way?

A．Because our eyes direct us to.

B．Because our ears direct us to.

C．Because of a slight structural or functional imbalance of our legs.

D．Because our eyesight and ears aren’t always in harmony with each other.

3．According to the research, we can be led to the target mainly due to .

A．our eyesight B．our brain C．our inner ear D．our sense of direction

4．Which of the following can prove that your ears help you walk according to the passage?

A．Your are always meandering most time, but you can arrive where you want to go.

B．After you turn around a lot with your eyes closed, you almost can’t keep balance.

C．When you walk to a target, you readjust your direction of walking regularly.

D．You start walking in a straight line, several steps afterwards you’ll change direction.

We have been told that under no circumstances the telephone in the office for personal affairs.

A．may we use B．we could use C．we may use D．did we use

The huge Florida wetland known as the Everglades is a slow-moving river 80 kilometers wide but only a few centimeters deep. People call the Everglades a “river of grass” because saw grass covers most of it. Saw grass is not really grass. It is a plant that has leaves edged with tiny sharp teeth that can easily cut through clothes--and skin!

Travel in the Everglades is difficult. You cannot walk through shallow water because the saw grass will cut you. The water is too shallow for regular boats. So, we use an airboat. An airboat is a flat, open boat. Like an airplane, it has a big propeller to move it. The propeller is fixed on the rear of the boat. It makes a tremendous noise, but it does the job. The beat skims along the water's surface. Although we can still get lost in an airboat, at least we are above the alligators （短嘴鳄）.

While hundreds of different kinds of animals live in the Everglades, the most famous is surely the alligator. Once endangered, alligators are now protected within Everglades National Park. Visitors are likely to see them both on land and in water.

For a long time, dangers have threatened the Everglades. Around 1900, some people felt this precious wetland should be drained（排干）.They said it was just a big swamp and not good for anything. In the 1920s, there was a land boom in Florida. People wanted to build homes everywhere, including in the Everglades. They built canals, levees, and other water systems that stopped the rivers flowing into the Everglades. Factories were built near rivers that flowed into the wetland. These factories dumped poisonous waste that damaged the Everglades ecosystem.

People are now working to preserve the Everglades National Park for the future. Right now, one big problem is the paper bark me. This tree is an invader from Australia.

Paper bark trees soak up a lot of water. In the early 1900s, people brought them to Florida because they thought they would help drain the Everglades. However, the invaders adapted too well. Paper bark trees have taken over hundreds of thousands of acres of the Everglades and killed other trees. Scientists are cutting down these invaders or spraying them with herbicides to kill them.

1．Why is it difficult to travel in Everglades?

A．Airboats may make a very big noise.

B．You may get lost when passing through.

C．Paper bark trees soak up too much water there.

D．Many different kinds of animals are to be protected.

2．Why do people use airboats instead of normal boats?

A．They have big propellers to move them faster than alligators.

B．The propeller makes loud noise so as to scare alligators.

C．Their fiat bottom can skim along the water surface.

D．They can watch alligators without hurting them.

3．The following measures were taken to drain the Everglades except that people .

A．built canals and levees to stop the rivers flowing into Everglades

B．built factories near rivers that flowed into the wetland

C．brought Paper bark to soak up water in Everglades

D．are cutting down these Paper bark trees.

4．The underlined word "invader" probably means something .

A．that moves in from another place

B．that enters and takes control

C．that has been brought in

D．that is in danger

High-speed trains travel at 300 kilometers an hour, which is about ______normal trains.

A．four times the speed as B．the speed four times of

C．four times as the speed of D．four times the speed of

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