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单选题The phrase "highly charged" (Para. 2) most probably means ______.

单选题Questions 5 to 7 will be based on the following news item.

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单选题 Passage Three Questions 32 to 35 are based on the passage you have just heard.

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单选题 An adult giraffe's head is about six feet above its heart. This means that to{{U}} (67) {{/U}} enough blood up to the brain the circulatory{{U}} (68) {{/U}} must be strong enough to keep the blood at very high pressure. Biologists have known for some time that giraffes solve this problem by having{{U}} (69) {{/U}} high blood pressure, about{{U}} (70) {{/U}} that of human beings. But an international team of biologists began to{{U}} (71) {{/U}} about this. If giraffes have such high blood pressure, they should have a{{U}} (72) {{/U}} problem with swelling in their legs and feet. Why don't giraffes have swollen feet? Giraffes should have{{U}} (73) {{/U}} problem, too. Every time they bend heads{{U}} (74) {{/U}} to drink, the blood should{{U}} (75) {{/U}} to their heads and have a hard time{{U}} (76) {{/U}} back up (when the head is down) to the heart. How come giraffes don't black out when they drink? The answer to the{{U}} (77) {{/U}} feet problem, the researchers found, is that giraffes have{{U}} (78) {{/U}} the researchers call a "natural anti-gravity suit". It{{U}} (79) {{/U}} out that the skin and other{{U}} (80) {{/U}} in their legs and feet are{{U}} (81) {{/U}} stiffer and tougher than those of other{{U}} (82) {{/U}} . As a result, the blood vessels in the leg cannot swell. Therefore, the blood has nowhere to go but back to the heart. What about blood rushing to the head{{U}} (83) {{/U}} the giraffe bends down to drink? The researchers found that the giraffe's jugular vein, which{{U}} (84) {{/U}} blood from the head back to the heart, has lots of one-way valves in it. In the giraffe's neck, there are lots of muscles that flex and relax repeatedly as the animal moves its head and sucks{{U}} (85) {{/U}} drinking water. By squeezing the valved jugular vein, they{{U}} (86) {{/U}} blood moving back to the heart even while the animal is drinking.

单选题 Questions 9 to 12 are based on the conversation you have just heard.

单选题As a group of young African immigrants struggles to adapt to life in the United States, an after-school drama program at White Oak Middle School aims to make their lives easier by first making them a little harder. Project X is a program that uses drama, dance, poetry and other creative outlets to help students discuss the tough and sometimes painful problems they face as pre-teen immigrants with significant language barriers. A final unveiling of their creation will be performed for friends and family at the end of the year at Imagination Stage. Wanjiru Kamau, coordinator of White Oak's African Club said it's important to give troubles to group members to help them find their place at the school. "It comforts those who are uncomfortable, and it discomforts those who are comfortable," Kaman said of Project X. Kamau teamed up with Imagination Stage after she noticed that many African students seemed uncomfortable talking about problems, such as being laughed at by their fellow students about how they look and talk. When most of the kids join the club, they speak little or no English, Kamau said. Each week, the club typically draws five to 10 students who are originally from Africa for discussion sessions and the Project X program. "We're going to express ourselves through our words and our actions, and that's powerful," said teaching artist Meg Green as she introduced fill-in-the-blank poems the students wrote about their identities. One student, Franck Ketchouang, 13, wrote, "I am from the world; I am love," which drew oohs and aahs from the group. Ketchouang has been in the United States less than a year, said Program Coordinator Chad Dike. When Ketchouang started attending Project X, he had been in the United States for two months and spoke no English. Now he's one of the group's most outgoing members and helps translate instructions from English to Creole for the group's newest member, who is from Haiti. Many people will give up when there's a language barrier, "but these students prove them wrong," Kamau said. "You do have something to give. You are important. When TV, media, etc. are bringing them down, this program is bringing them up./

单选题Between 1974 and 1997, the number of overseas visitors expanded ___________ 27%.

单选题The police are _________for the preservation of public order and security.

单选题We all _________ the great achievements he has made in his work.

单选题A．Inthenewspaper.B．OntheTV.C．Fromhercolleague.D．Fromtheradio.