1、 What is clear, however, is that howling is often used among packmates to locate each other. Hunting grounds are distant and it happens that wolves may separate from one another at times. When this happens, howling appears to be an excellent means of gathering. Howling, interestingly, is a contagiou
2、s behaviour. When one wolf starts to howl, very likely others will follow. This is often seen to occur in the morning, as if wolves were doing some sort of “roll call” where wolves all howl together to report their presence. 1. What is the possible similarity between wolves howling together and huma
3、ns singing in chorus?C. The act of hunting for something. D. The sense of belonging to a group.2. Why does Harrington think the “social bond” theory may be wrong?A. Wolves separate from each other after howling.B. Wolves tend to protect their hunting grounds.C. Wolves sometimes have quarrels after h
4、owling together.D. Wolves of low rank are encouraged to join in the chorus.3. Researchers are sure that wolves often howl to.4. “Howling. . . is a contagious behaviour” (in the last paragraph)means.C. howling often occurs in the morning D. howling spreads from one to another【参考答案】1-4 DCBDAOn a sunny
5、 day last August, Tim heard some shouting. Looking out to the sea carefully, he saw a couple of kids in a rowboat were being pulled out to sea.Two 12-year-old boys, Christian and Jack, rowed out a boat to search for a football. Once theyd rowed beyond the calm waters, a beach umbrella tied to the bo
6、at caught the wind and pulled the boat into open water. The pair panicked and tried to row back to shore. But they were no match for it and the boat was out of control.Tim knew it would soon be swallowed by the waves.Everything went quiet in my head, Tim recalls (回忆). I was trying to figure out how
7、to swim to the boys in a straight line.Tim took off his clothes and jumped into the water. Every 500 yards or so, he raised his head to judge his progress. At one point, I considered turning back, he says. I wondered if I was putting my life at risk. After 30 minutes of struggling, he was close enou
8、gh to yell to the boys, Take down the umbrella!Christian made much effort to take down the umbrella. Then Tim was able to catch up and climb aboard the boat. He took over rowing, but the waves were almost too strong for him.Lets aim for the pier (码头), Jack said. Tim turned the boat toward it. Soon a
9、fterward, waves crashed over the boat, and it began to sink. Can you guys swim? he cried. A little bit, the boys said.Once they were in the water, Tim decided it would be safer and faster for him to pull the boys toward the pier. Christian and Jack were wearing life jackets and floated on their back
10、s. Tim swam toward land as water washed over the boys faces.“Are we almost there? they asked again and again. Yes, Tim told them each time.After 30minutes, they reached the pier.1. Why did the two boys go to the sea?A. To go boat rowing. B. To swim in the open water.C. To get back their football. D.
11、 To test the umbrella as a sail.2. What does it in Paragraph 2 refer to? A. The beach. B. The wind. C. The boat. D. The water.3. Why did Tim raise his head regularly? A. To check his distance from the boys. B. To consider turning back or not. C. To take in enough fresh air. D. To ask the boys to tak
12、e down the umbrella.4. How did the two boys finally reach the pier? A. They were carried to the pier by Tim on his back. B. They swam to the pier all by themselves. C. They were washed to the pier by the waves. D. They were dragged to the pier by Tim. 参考答案1-4 CBAD BWhat will power your house in the
13、future?Nuclear,wind,or solar power?According to scientists at the Massachusetts Institute of Technology (MIT) in the US,it might be leaves but artificial (人造的) ones.Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用)Now researchers have found a way to imitate this seemingly simple process.The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a specia
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