DOC《怀柔区2018高级中等学校招生考试第一次模拟试题》

98 percent of them now have no tusks, reported The Independent newspaper. The number was

15 percent in

1998 and only

1 percent in 1930, according to the BBC. But this solution has less been developed by elephants themselves, and more by evolution. Evolution is all about natural selection(选择). When an environment changes, for example, animals and plants that can deal with the change will stay alive while others won'

t. And for elephants, the change came when hunters started killing them for their tusks. As a result, elephants with big tusks couldn'

t stay alive because hunters wanted to shoot them. Those born with tusks managed to stay alive and give their tuskless genes(基因)to their babies. As a result, more and more elephants are now being born without tusks. But this solution, as effective(有效地)as it might be, is a high price to pay for elephants. Tusks are important and play a number of roles, especially for male elephants, including fighting with other males, lifting and digging things up. This is why scientists hope there can be other ways to protect elephants against hunters. They believe that when they are less likely to be killed , elephants will be able to grow tusks again. To David Cowdrey, head of Policy and Campaigns at the International Found for Animal Welfare UK, however, this is not very likely to happen in the near future. Unfortunately, it comes down to the markets, he told The Guardian. As long as people will pay high prices for products that come from endangered animal and plants, they'

re going to have price on them and that causes the hunting. 27. Which of the following is TRUE according to the passage? A. Elephants learned to lift and dig things up without tusks. B. Elephants chose not to grow tusks because of their dangerous environment. C. Elephants with no tusks had a greater chance of passing down their genes. D. A tuskless elephant gives birth to more baby elephants than an elephant with big tusks. 28. The underlined word evolution in paragraph

4 means A. gradual change B. sudden development C. complete loss D. rapid growth 29. What can you learn from the last two paragraphs? A. We should work out a better solution to protect elephants. B. People should pay lower prices for products made with elephant tusks. C. Elephants'

living environments will soon be improved. D. The key to elephant protection is stopping the trade in tusk products. D Just like rice and noodles are different from bread, snacks in China are a world apart from those in the UK and the US. For one thing, I never imagined that sunflower seeds(瓜子) would be so popular here. I spotted people having them while waiting for tables outside restaurants, before dinner and, of course, while watching TV. I also saw that a plate of sunflower seeds is always on offer during the Spring Festival holidays. I had seldom tried sunflower seeds when I came to China. In the UK, though, young people love their snacks. In fact, young people in Britain eat more snacks than people of the same age in other European countries. A recent survey has discovered that

64 percent of under 20-year-olds snack between meals, according to an article on the British Council website. In comparison,58.7 percent of young people snack in Germany,

53 percent in France, and only 40.7 percent in Spain. British sn........