【答案解析】[听力原文]32-35 Scientists say sharks have lived in the world's oceans for millions of years. Scientists say there are more than three-hundred-fifty different kinds of sharks. Sharks do not have bones, and a shark bas an extremely good sense of smell. It can find small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. Sharks also sense electrical and magnetic power linked to nerves and muscles of living animals. These powerful senses help them find their food. Some sharks will eat just about anything. Many unusual things have been found in the stomachs of some tiger sharks. They include shoes, dogs, a cow's foot mid metal protective clothing. About forty percent of the different kinds of sharks lay eggs. The others give birth to live young. Some sharks carry their young inside their bodies like humans do. Scientists are beginning to understand the importance of sharks to humans. Medical researchers want to learn more about the shark's body defense system against disease. They know that sharks recover quickly from injuries. Sharks appear never to suffer infections, cancer or heart diseases. 32. What is this passage mainly about?
[试题分析]细节考查题。 [详细解答] 相关句子：“Sharks do not have bones, and a shark has an extremely good sense of smell. It can find small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. Sharks also sense electrical and magnetic power linked to nerves and muscles of living animals. These powerful senses help them find their food."可以看出鲨鱼靠敏锐的嗅觉和电磁感觉来捕食猎物。
【正确答案】
C
【答案解析】[听力原文] In which point some sharks are similar with humans?
[试题分析]细节考查题。 [详细解答] 相关句子：“Some sharks carry their young inside their bodies like humans do."可以看出部分鲨鱼的生育方式与人类一样。
【正确答案】
B
【答案解析】[听力原文] Why sharks are useful for humans?
[试题分析]客观事实题。 [详细解答] 相关句子:"Medical researchers want to learn more about the shark's body defense system against disease."可以看出人类渴望通过研究鲨鱼的抗病机理以期对人类有帮助。