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听力原文：What do whales do about those harmful plants and animals？
What do whales do about those harmful plants and animals？
They__________ enormous amounts of these harmful plants and animals.
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更多“听力原文：What do whales do about those harmful plants and animals？ What do whales do about”相关的问题
听力原文：Why do people want to save the whales？
Why do people want to save the whales？
Because they help to __________between plants and animals.
听力原文：Why do people want to save the whales Why do people want to save the whales Beca听力原文：Why do people want to save the whales Why do people want to save the whales Because they help to __________between plants and animals.
听力原文：What is the terrible result of continuing hunting whales？
What is the terrible result of continuing hunting whales？
They will gradually __________in the world.
听力原文： Why do people want to save the Whales？ There are two important reasons. One reason is that whales help to keep a balance between plants and animals. People have disturbed this balance. People get rid of their wastes by throwing them into the oceans and seas. People's sewage and garbage increase the salt in ocean and sea water. The increased salt helps some plants and some very small animals to grow. These plants and animals can be harmful to fish. Whales eat enormous amount of plants and animals that grow in very salty water. Therefore, whales are very important because they keep the ocean environment clean enough for fish. In addition, because fish provide necessary food for many people, people need whales, and many people want to save them.
(23)
A．Because whales keep a balance between plants and animals on land.
B．Because whales eat a lot of fish.
C．Because whales eat large amounts of garbage.
D．Because whales keep oceans clean for fish, and people need fish.
听力原文： The vast oceans of the world are dark, deep and mysterious places where eyesight counts for little as soon as you venture very far beneath the surface.
For humans, who live in a world dominated by visual stimuli, to exist in such conditions would be impossible. But for whales and dolphins that live in the ocean or, in the case of a few species, muddy rivers, the darkness is unimportant. What is important to them is sound.
Sound is an efficient way to transmit and sense information, especially as it travels five times faster through water than through air. If humans shout to someone, it is unlikely that they will be heard a kilometer away. But if a whale shouts in an ocean channel, another whale may hear it tens, if not hundreds, of kilometers away.
Whales and dolphins use sound in two ways: for communication and for echolocation. Dolphins and toothed whales communicate through a wide variety of high-frequency sounds.
But as well as using sounds to communicate, toothed whales and dolphins also rely on echolocation to learn about their immediate environment, including prey that might be waiting nearby. They produce intense short broad-band pulses of sound in the ultrasonic range. These clicks are brief, typically less than one millisecond long—but they are repeated many times each second.
(4)
A．Sense of sight.
B．Sense of hearing.
C．Sense of smell.
D．Sense of taste.
W: Yes, l am, and I can't wait! I've never been up close to a whale before. Do you think we'll see many whales today？Cindy told me she didn't see anything last time, so I think it really depends on luck. What would you say？
M: Well, I think we should have better luck, because this is the best time of the year to see whales.
W: Why is winter the best time of the year to see whales？
M: At this time of the year, the whales are heading south from Alaska to warmer water for the winter. Then they'll return to Alaska before summer.
W: So we can see lots of whales busy traveling at this particular point. By the way, do you know how long the boat trip is？ Cindy said it was like quite a long day, and I think it was probably because she didn't see anything.
M: The boat leaves at one o'clock and returns at about three o'clock. So you may want to get to the fisherman's wharf before one.
W: Only a two-hour trip？
M: Yes, the whale-watching travel is pretty close to shore, so we don't need to go out very far in the ocean to see them.
W: I guess two hours is probably enough. I've never actually been out on the ocean in a boat, and I'm not really sure I'll like it. OK, then, I will see you this afternoon？
(9)
A．She was very lucky to see many whales.
B．She didn't go to the whale-watching trip.
C．She didn't see a whale on her whale-watching trip.
D．She liked the whale-watching trip very much.
M: (23) Genes and environment work together to shape who we are. As the environment includes everything we experience and come into contact with from birth through to death, it also plays an extremely complex role.
W: What is gene, then？
M: Even scientists disagree on exactly how to define a gene. Generally, a gene is a sequence of DNA that tells us what a single protein does. Proteins do the work of the body, building structure and stimulating biochemical reactions.
W: (24)How genetically similar are we to one another？
M: Individual humans are extremely similar to each other. They share 99.9 percent of their DNA no matter which race they belong to.
W: How genetically similar are we to other species？
M: Scientists have been amazed at how genetically similar humans are to other species. Humans share 80 percent of their genes with mice, about 99 percent of DNA with chimpanzees. That means that chimpanzees are more closely related to humans than to other animals, such as monkeys, whales or cats.
W: (25)Will genes lead to a cure for cancer and other serious disease？
M: Of course! Virtually every disease has genetic cause. Some are simple misspellings that can be corrected with gene therapy, although this technology is still in its infancy. Scientists will gain more knowledge about genes, and they will develop new treatments based on that knowledge. The outlook is especially good over the next few decades for some cancers and other disease.
(20)
A．Environment and genes.
B．Cells of proteins.
C．Genes of parents.
D．A sequence of DNA
听力原文：What did the grandfather do in Trafalgar Square？
What did the grandfather do in Trafalgar Square？
He ______________.
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Whale watching is a growing ecotourism industry around the world. It can be emotional, educational and an important part of local economies, offering a unique opportunity for people to appreciate the magnificence of whales in their natural habitat and to help motivate people to protect these animals and their environment. (26) Additionally, much of what scientists know about whales is a result of research conducted while they are aboard commercial whale watching vessels.
However, unregulated whale watching can also lead to problems, including threats to the animals' well-being and negative impacts on fragile coastal environments. In addition to increasing numbers of whale watching vessels, in many parts of the world, newer boats are capable of going much faster than in the past, with the increasing likelihood that whales will be hit by boats. The faster a vessel moves, the less likely the operator is to see a distant whale, and the less time they have to react once they do spot an animal. (27)Also researchers have found that if whales are feeding or socializing, they are less likely to react to an oncoming vessel and can be hit.
In response to this problem, whale watching groups, government agencies and private advocacy groups have established codes of conduct for whale watching. Under these rules, approaching an area of known whale activity should be done slowly and with caution, stopping to survey the area. (28)In addition, approach parallel to the whales and travel at the same speed as the slowest animals. Stay at least 100 meters away and don't leapfrog into the path of the whales. Preferably, there should only be two vessels at a time viewing a group of whales.
(27)
A．By research with commercial whale watching tour.
B．By research with navy marine.
C．By research with whaling hunting.
D．By research with local fishermen.
听力原文：What's your hobby？
(14)
A．Sorry.
B．What do you think？
C．Swimming．
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