【正文】 sh in dustbins. ※ No smoking. 25. How much will a couple with two children aged one and three pay if they visit the zoo? A. 30 US dollars. B. 40 US dollars. C. 20 US dollars. D. 50 US dollars. 26. What can visitors do in the zoo? A. Feed animals food. B. Take pictures of animals. C. Let birds sit on their shoulders. D. Smoke in a particular area. 27. What do we know about the zoo from the text? A. It is the best zoo in the world. B. Visitors can?t visit it every day. C. You cannot buy any food in the gift shop. D. Animals cannot be viewed very close. 28. Where can we probably find this text? A. In a science newspaper. B. In an animal book. C. On a travel website. D. In a fashion magazine. C Many people traveled to Las Vegas, Nevada last week for the 50th Consumer Electronics Show, or CES. The show is said to have the largest collection of new electronic devices(電子設(shè)備 ) in the world. The 2017 show had many examples of “smart home” devices. “Smart home” technology is designed to make life easier for people by letting puters control many things inside our homes. Jeremy Warren is with smart home service provider Vivint. “When someone es to your front door and rings the doorbell, the light can turn on immediately. I get a reminder when I?m halfway around the world that someone has e, and I can start talking to the person who?s at my front door. I can say, ?Oh, here, let me let you in.? I can unlock the door for the person very easily.” Another use of smart home technology is being able to watch what is taking place in your home. One electronics maker invented a device that lets people see and “municate with” their animals when they are away. The device, from Petcube, lets you remotely watch and talk to your pet through a personal device. It can even give the pet a treat — if you approve and order it. While most of the devices can be controlled from anywhere, they also work in the same way when you are at home. Some devices, like Amazon?s Echo and Google Home, even let you use voice mands to talk to them. A concern for many homeowners is the possibility that someone else might find a way to attack these smart home devices. An official from Vivint said his pany is sure that only owners of the home can gain use of information on the devices. Many of these devices at the Consumer Electronics Show were available before. But now they municate better and can learn repeat behavior and habits. All of them can be bought separately, many for less than US$100. 29. Through the 2017 Consumer Electronics Show, people can learn _______________. A. how to design new electronic devices B. how to decorate their home beautifully C. how to control things at home while they are out D. how to maintain safety at home 30. What can people NOT do by using the electronics provided by Vivint? A. Talk with the person at their door. B. Unlock the door for the person at the door. C. Give the door key to the person at the door. D. Know that someone has dropped by. 31. The device developed by Petcube makes it possible to _____________. A. give the pet some food when you are not in B. give food to animals anywhere in the world C. walk a pet at any time you want D. guide others to one?s home D For young people, friends are often determined by their being close. Whoever is around is your friend. As humans get older, they bee more selective (講 究的 ) in choosing whom they spend time with, as well as how they spend their time. According to a new study, the same goes for monkeys. The findings, in the journal Cell Biology, suggest human selectivity may be a very strong part of our evolutionary history (進(jìn)化史 ). “An important finding suggests that humans bee more socially selective when they know that their remaining life time is limited, such as in old age,” Professor Laura Almeling explained. “We don?t think that monkeys are aware of their own limited future time. Therefore, if they show similar changes in old age, their selectivity cannot be attributed to their knowledge about a limited future time,” she continued. Researchers showed a variety of new animal toys, only one of which included a food treat, to a group of African monkeys. Young monkeys quickly grew out of their interest in the toys, preferring only the object that included food once they grew up. Researchers also measured how monkeys? social activities change as they age, by watching and measuring their responses to pictures and sounds of friends. Although older monkeys still took part in and remained interested in group activities, they put less time and energy into social relationships. “With increasing age, the monkeys became more selective in their social activities,” Almeling said. “They had fewer ?friends? and put less time into social activities. Interestingly, however, they were still interested in what was going on in their social world. Older females continued to respond particularly strongly to hearing a scream for help from their best friend,” Almeling explained. “Older males still liked to look at pictures of the newborns,” she said. 32. What has the new study found? A. Humans have many things in mon with monkeys. B. Monkeys bee closer to each other as they get older. C. Monkeys get more selective as they get older. D. Humans choose friends more seriously when they are older. 33. What happens to monkeys as they get older? A. They choose friends and social activities more carefully. B. Their knowledge about their future time grows. C. They bee aware that they have little time left. D. They show more interest in food. 34. What can the underlined words be replaced by? A. Be devoted to. B. Be helpful to C. Be caused by. D. Be aware of. 3