C. It’s possible to result in poor memory.

　　D. It increases students’learning interest.

　　【参考答案】1—4、ADAB

　　较难题目特训：介绍说明类

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　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 two-thirds of its body not 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 head. It blows a double stream of water that can rise up to 4 meters above the water.

　　The humpback has a small dorsal fin located towards the tail flukes about two-thirds 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 fingerprints:　no two are the same.

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