题目

计算： 答案：【答案】【解析】根据多项式除以单项式法则和合并同类项法则计算即可．解：==．阅读理解。     When people think of tigers, they think: strong and dangerous. But now, the big animal is calling for our help.     There were once eight kinds of tigers in the world, but three died out during last century. In the last 70 years, the number of Siberian tigers (东北虎) has gone from as many as 300 to somewhere between 18 and 22.     The World Wildlife Fund (WWF) started a program recently. It is about to put an end to tiger poaching (非法狩猎) and save wild tigers. China, together with 12 other countries, has joined in. The aim is to double (使…加倍) the number of wild tigers in the next ten years.     According to research by Chinese officers and the WWF, the Siberian tiger is already one of the world's most endangered animals. "If the government doesn't take any action, it's quite possible that there will be no more Siberian tigers in China in 10 to 20 years," said Zhu Chunquan, director at the WWF's Beijing office.     Wild animals such as the red deer, sika deer (梅花鹿) and wild boar (野猪) are the tigers' main food. The poaching of these animals is the greatest threat to tigers. Traps (陷阱) are also a threat. In October, the people of Mishan, Heilongjiang found a dead Siberian tiger with a wire (金属丝) around its neck.     "Volunteers from the WWF remove traps every year, but the fact is that we cannot clear all the traps ourselves," Zhu said. The most important thing people can do is to save the animals which tigers eat. "Toprotect the tigers, we need to call on more people to stop eating wild animals."1. What are tigers like in people's eyes?A. lovely and friendly   B. lovely but dangerous C. strong but friendly   D. strong and dangerous2. How many kinds of tigers are left (剩余) in the world now?A. 11       B. 8       C. 5       D. 33. Why did the WWF start a program recently?A. It was started to stop poaching and save animals in danger.B. It was started to stop poaching and save wild tigers.C. It was started to call on more countries to join in the WWF.D. It was started to call on more countries to protect animals.4. Which of the following is the reason why the number of Siberian tigers is becoming smaller and smaller?    ① The poaching  ② traps  ③ people's eating of wild animals  ④ fewer volunteersA. ①②④       B. ①③④     C. ①②③   D. ②③④5. The word "threat" in Paragraph 5 means _______ in Chinese.A. 威胁B. 方法C. 狩猎D. 征兆