单项选择题 听力原文： I spoke yesterday about the construction of ancient Viking ships. Today I'd like to discuss the transocean voyages that the Norse made in these open boats-voyages made without compasses or charts. Somehow the Vikings managed to get across the North Atlantic and back home again. Although the shortest distance between the coast of Norway and Green- land is about 900 miles, the Vikings preferred to take a longer route south of Iceland and there-by avoid pack-ice. This was a voyage of well over one thousand miles. How did Norse sailors find land after days of sailing out of sight of land? well, experienced sailors used the relative position of the stars to help them navigate. The sun's position could also be noted, but it moves across the sky and its position alters a little every day, so it was not easy for the Vikings to use. However, even when out of sight of land, an experienced sailor could find in- formation. As there are landmarks on land, so there are at sea. Whales gathered in large numbers to feed at an area half a day's sail south of Iceland. Migrating birds on their annual flight were also helpful because they always followed the same route. So, geese flying between Britain and Iceland were of particular use to the Vikings. One Icelander also took ravens with him, releasing them until one day they didn't return. He followed their direction and found land. In 900 A. D, ingenuity had to take the place of technology.What is the main topic of the talk?A．Life in Norway during Viking(海盗)times.B．Different ocean routes taken by the Vikings.C．Methods used in Viking navigation.D．The importance of migrating geese in Viking navigation.
单项选择题 一种转基因的新品种水果有良好的口感和更丰富的营养，考虑到人们对转基因副作用的担忧，要采取一定措施来推广这种新品种水果。 以下哪项最有利于推广这种新品种水果?（）
单项选择题 听力原文：W: How are your new neighbors, Nancy?M: They seem nice enough, but they have a son who's driving me crazy.W: What do you mean?M: He comes home every night around 10 with his car windows rolled down and radio blaring. It stops as soon as he turns the car off. But by then Brian and Lisa are wide awake.W: Oh, no.M: Oh, Yes. Sometimes it takes us till mid-night just to get them settle down again.W: Have you tried talking to them?M: We haven't even really met them yet except to say a quick hello. I hate to get off on our own foot.W: You are not going to like them when you do meet them if you keep on simmering.M: I know, but I feel stupid complaining.W: You said yourself it is driving you crazy.M: Well, You know how early have to get up to be here at the office. I'm just not getting enough sleep and neither are the kids. They're so irritable that I get home in the afternoon.W: Maybe you could go over sometime with a little gift: a plant for the yard or something. Then you could ask about their son whether they have any other children and they'll be sure to ask about yours.M: Yeah, and then what?W: Then you could mention that the hardest thing at his stage is getting your kids to get sleep at night.M: And keeping them in the sleep.W: That's the idea. And you should do it soon, The longer you wait, the harder it will be to do politely.What bothers Nacy about her neighbor's son?A．He drives too fast.B．He plays his guitar too loudly.C．His radio wakes her children.D．His friends are too noisy.