四级听力复合听写模拟训练第15套

　　Section C

　　Directions: In this section, you will heat a passage three times. When the passage is read for the first time. you should listen carefully for its general idea. When the passage is read for the second time. you are required to fill in the blanks numbered.from 36 to 43 with the exact words you have just heard. For blanks numbered from 44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words you have just heard or write down the main points in your own words. Finally. when the passage is read for the third time. you should check what you have written.

　　注意：此部分试题在答题卡2上;请在答题卡2 上作答。

　　Part Ill Section C

　　Scientists have developed a new cancer drug. So far, they have tested it only on __ animals. The drug is designed to __ and kill cancer cells but not healthy cells.

　　First, the drug enters the cancer and destroys the supply of blood. Then it releases __ to destroy the cancer cells.

　　Researchers at the Massachusetts Institute of Technology in Cambridge carried out the study. The __ appeared in Nature __. A school news release called the drug an anti-cancer smart bomb.

　　Ram Sasisekharan is a professor at M.I.T. He says his team had to __ three problems. They had to find a way to destroy the blood vessels, then to __ the growth of new ones. But they also needed the blood vessels to supply

　　chemicals to destroy the cancer.

　　So, the researchers designed a two-part nanocell. The cell is in nanometers, or one thousand millionth of a meter.

　　The scientists say it was small enough to pass through the blood vessels of the cancer, but it was too big to enter normal blood vessels. The surface of the nanocells also helped them to avoid natural defenses.

　　That cut off the blood supply and trapped the nanocell inside the cancer. Then, the nanocell slowly released chemotherapy drugs to kill the cancer cells.

　　Section C

　　Scientists have developed a new cancer drug. So far, they have tested it only on laboratory animals. The drag is designed to invade and kill cancer cells but not healthy cells.

　　First, the drug enters the cancer and destroys the supply of blood. Then it releases poison to destroy the cancer cells.

　　Researchers at the Massachusetts Institute of Technology in Cambridge carried out the study. The results appeared in Nature magazine. A school news release called the drug an anti-cancer smart bomb.

　　Ram Sasisekharan is a professor at M.I.T. He says his team had tosolve three problems. They had to find a way to destroy the blood vessels, then to prevent the growth of new ones. But they also needed the blood vessels to supply chemicals to destroy the cancer.

　　So the researchers designed a two-pan nanocell. The cell is measured m nanometers, or one thousand millionth of a meter. The particle used was two hundred nanometers-much, much smaller than a human hair.

　　The scientists say it was small enough to pass through the blood vessels of the cancer, but it was too big to enter normal blood vessels. The surface of the nanocells also helped them to avoid natural defenses.

　　The scientists designed the cell as a balloon inside a balloon. They loaded the outer part with a drug that caused the blood vessels to fall in on themselves. That cut off the blood supply and trapped the nanocell inside the cancer. Then, the nanocell slowly released chemotherapy drugs to kill the cancer cells.

　　The team says the treatment shrank the cancer and avoided healthy cells better than other treatments.

　　Section C

　　文章精要

　　科学家发明了一种治疗癌症的新型药物，这种药物可以进入癌细胞并杀死癌细胞，同时对正常细胞没有损害。

　　36.1aboratory

　　37.invade

　　38.poison

　　39.results

　　40.magazine

　　4 1.solve

　　42.prevent

　　43.measured

　　44.The particle used was two hundred nanometers-much，much smaller than a human hair.

　　45.The scientists designed the cell as a balloon inside a balloon.They loaded the outer part with a drug that caused the

　　blood vessels to fall in on themselves.

　　46.The team says the treatment shrank the cancer and avoided healthy cells better than other treatments.