以是否有获利机会为标准，火灾、沉船、车祸等均属于( )。
A．投机风险
B．纯粹风险
C．财产风险
D．人身风险
参考答案：B
解析： 按风险的性质不同，风险可分为纯粹风险和投机风险。纯粹风险是指只造成损失而无获利可能性的风险。投机风险是指既可能造成损失也可能产生收益的风险。所以排除 A。另外C、D不是以是否有获利机会为标准划分的。所以答案为B。
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Humpback whales  Humpback whales are sometimes called performers of the ocean.This is because they can make impressive movements when they dive.The name “humpback”, which is the common name for this whale, refers to the typical curve shape the whale's back forms as it dives. Sometimes the humpback will dive with a fantastic movement known as a breach.During breaching the whale uses its powerful tail flukes to lift nearly twothirds of its body out of the water in a giant leap.A breach might also include a sideways twist with fins stretched out like wings, as the whale reaches the height of the breach. A humpback whale breathes air at the surface of the water through two blowholes which are located near the top of the head.It blows a double stream of water that can rise up to 4 metres above the water. The humpback has a small dorsal fin located towards the tail flukes about twothirds of the way down its back.Other distinguishing features include large pectoral fins, which may be up to a third of the body length, and unique black and white spots on the underside of the tail flukes.These markings are like finger prints: no two are the same. Humpback whales live in large groups.They communicate with each other through complex “songs”
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| 1. According to Quick Facts, a humpback whale _____. A. cannot survive in waters near the shore B. doesn't live in the same waters all the time C. lives mainly on underwater plants D. prefers to work alone when hunting food 2. To make a breach, a humpback whale must _____. A. use its tail flukes to leap out of the water B. twist its body sideways to jump high C. blow two streams of water D. communicate with a group of humpbacks 3. From the passage we can learn that a humpback whale _____. A. has its unique markings on its tail flukes B. has black and white fingerprints C. gets its name from the way it hunts D. is a great performer due to its songs | ||||||||||||||