完形填空：阅读下面短文。选出最佳选项。 Save the Wild Tiger 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 1 in the world, but three died out during the 20th century.  In the last 70 years, the 2 of Siberian tigers (东北虎) has gone from as many as 300  to 3 22 somewhere. The Siberian tiger has been 4 dying out completely. If the government doesn't make any efforts, it's quite 5 that there will be no more Siberian tigers in China in ten to twenty years. In order to double the number of wild tigers in the 6 ten years, the World Wildlife Fund (世界自然基金会) has started a program recently. It 7 save wild tigers and put an end to tiger hunting and killing. China, together with twelve other 8 , has joined in. Wild animals, such as red deer and wild pigs, are the main 9 of the tigers. The hunting of these animals is the greatest threat (威胁) to tigers. So the most important thing is 10 the animals that tigers eat. To protect the wild tigers, we need to call on more people to stop eating and hunting wild animals. (     )  1. A. pigs (     )  2. A. name (     )  3. A. less than (     )  4. A. in need of (     )  5. A. possible (     )  6. A. last (     )  7. A. aims to (     )  8. A. cities (     )  9. A. friends (     ) 10. A. to sell B. tigers B. kind B. more than B. in danger of B. impossible B. next B. used to B. provinces B. food B. to kill C. deer C. number C. bigger than C. in front of C. necessary C. past C. refuses to C. countries C. members C. to save