Read the article and select the best answer. Article: A predator kills and eats other animals as prey .Sometimes it also becomes food for other predators. Polar bears are the largest of all the land predators. They can run across snow and swim in icy water for hours without rest. Their favorite food is seal. Not all big animals live on small animals. Hippos have heavy bodies and huge mouths. But they don't eat animals. They just eat grass. Some predators use speed to catch their prey. Cheetahs are the fastest animals on land. They can run up to 70km an hour. Other predators use their senses to find their food. Sharks can see, smell, hear, feel and taste. They can also sense electrical currents( )from other animals' bodies. Some fish try to hide themselves, but with this sixth sense, sharks can always find them. Sharks have smooth bodies. This helps them swim without using lots of energy. They need to save their energy because they never really sleep and never stop hunting. Flying is a useful skill for many predators in the sky. The butcher bird is the most interesting predator. It has a special way of eating its prey. First it kills its prey. Then it hangs it on a fence or in a tree, just like a butcher hangs meat in his shop. Finally, it eats its prey. Some people hunt and kill more animals than any other predator. They not only hunt for food. They also hunt for fun. They kill sharks for their fins, and tigers for skins. Those human hunters are the worst predators on Earth. Question: Among the sharks, the tigers, the polar bears and some people, which are the most dangerous predators on earth? Options: A: the sharks. B: the tigers. C: the polar bears. D: some people.
D

Read the article and select the best answer. Article: Almost everyone has dropped some food on the floor and still wanted to eat it.If someone saw you drop it, he or she might have shouted, " 5-second rule!" This so-called rule says food is OK to eat if you pick it up in five seconds or less.But is that true? Professor Anthony Hilton from Ashton University, UK, tested the rule with his students.They found that food dropped for five seconds is less likely to contain bacteria than if it sits there for longer. For the study, Hilton and his students tested a lot of foods----bread, pasta, cookies and candy--to see how much bacteria they had when they made contact with the floor.They allowed the food to lie on the different types of flooring--carpet , laminate and tile -- for three seconds to 30 seconds. Not surprisingly, the longer the food was on the floor, the more bacteria it had.And the type of floor where the dropped food landed had an effect.Bacteria are least likely to transfer from carpet, while they are most likely to transfer laminate or tiled surface after more than five seconds. The study also found that the wetter the food, the more likely it was to pick up bacteria.Although most people are happy to follow the 5-second rule, eating food dropped on the floor still carries an infection risk."It very much depends on which bacteria are on the floor at the time." Hilton told Forbes. Question: According to the article, the infection risk of the dropped does NOT depend on _ . Options: A: how long the food sits on the floor B: what the dropped food is C: what the bacteria are D: what the weather is like that day
D

Q: Read the article and select the best answer. Article: In the 13th century, the Italian traveler, Marco polo , traveled a long way to China , During his stay in China , he saw many wonderful things . One of the things he discovered was that the Chinese used paper money . In western countries , people did not use paper money until the 15th century . However , people in China began to use paper money in the 7th century . A Chinese man called CaiLun invented paper almost 2000 years ago. He made it from wood . He took the wood from trees and made it into paper . He then put these pieces of paper together and made them into a book . Now paper still comes from trees . We use a lot of paper every day ! If we keep on wasting so much paper , there will not be any trees on the earth . If there are no trees , there will be no paper . Every day , people throw away about 2800 tons of paper in our city . It takes 17 trees to make one ton of paper . This means that we are cutting nearly 48000 trees every day . Since it takes more than 10 years for a tree to grow , we must start using less paper now . If we don't , we will not have enough time to grow more trees to take the place of those we use for paper . So how can we save paper ? We can use both sides of every piece of paper , especially when we are making notes .We can choose drinks in bottles instead of those in paper packets . We can also use cotton handkerchiefs and not paper ones . When we go shopping , we can use fewer paper bags . If the shop assistant does give us a paper bag, we can save it and reuse it later . Everyone can help to save paper . If we all think carefully , we can help protect trees . But we should do it now , before it is too late . Question: When he was in China , Marco polo _ . Options: A: discovered CaiLun invented paper B: learned to make paper C: saw many wonderful things D: told people about it
A: C

Read the article and select the best answer. Article: On the fifth day of the fifth month of the Chinese lunar calendar , which is Wednesday this year, all Chinese celebrate one of their traditional festivals, the Dagon Boat Festival, or Dragon Boat Festival. Their celebrations include eating zongzi, rice wrapped in bamboo leaves in the shape of a pyramid, racing dragon boats and sticking _ on their doors. In 2007, the central government decided to add the Dragon Boat Festival, together with two other traditional festivals - Tomb Sweeping Day and Mid Autumn Festival - to the list of public holidays According to tradition, our ancestors believed the hot weather in midsummer might cause different kinds of diseases . So, to keep off diseases and drive out evil were the main purposes of the Dragon Boat Festival. Parents used colorful threads to make necklaces and bracelets for children, gave them beautiful embroidered bags , painted the Chinese character for "king" (wang) on their foreheads to drive away bad luck. The Dragon Boat Festival was also called "kids festival" in some places. Spending such happy hours with parents, young children began to understand the festival as well as the traditions and culture behind it. Repeating the customs year by year makes it possible for kids to learn the traditions, accept it and pass it on when they become adults. Question: How do people celebrate the Dragon Boat Festival? Options: A: People celebrate this festival by eating eggs. B: People celebrate this festival by eating zongzi, racing dragon boats. C: People celebrate this festival by sending cards. D: People celebrate this festival by singing and dancing.
B