文章大意：本文是一篇说明文。文章介绍了中国南部对鱼翅的喜爱导致了鲨鱼数量严重下降的情况，以及对整个生态系统的影响，同时环保组织也在呼吁政府立法来禁止鲨鱼翅的买卖。
阅读下面短文，从各小题所给的四个选项中选出最佳选项。
Many have heard of shark fin soup. This famous and expensive dish is especially popular in southern China. But do you realize that you’re killing a whole shark each time you enjoy a bowl of shark fin ______ ?
When people catch ______ , they cut off their fins and throw the shark back into the ocean. This is not only cruel, but also ______ to the environment. Without a fin, a shark can no longer swim and ______ dies. Sharks are at the top of the food chain in the ocean’s ecosystem. If their numbers drop too low, it will bring ______ to all ocean life. Many believe that sharks can never be endangered because they are the strongest in their food chain. But in fact, around 70 million sharks are ______ and traded in this industry every year. The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.
Environmental protection groups around the world, such as WildAid and the WWF, are teaching the public ______ “finning”. They have even asked governments to develop laws to ______ the sale of shark fins. So far, no scientific studies have shown that shark fins are ______ for health, so why eat them? Help ______ the sharks!
11. | A．soup | B．season | C．product | D．chance |
12. | A．animals | B．fish | C．ocean | D．sharks |
13. | A．useful | B．harmful | C．helpful | D．important |
14. | A．slowly | B．politely | C．widely | D．loudly |
15. | A．danger | B．safety | C．success | D．warmth |
16. | A．asked | B．required | C．caught | D．educated |
17. 18. | A．continue | B．stop | C．support | D．examine |
19. | A．good | B．bad | C．terrible | D．relaxed |
20.
