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  3. Elephants are perhaps the only animals that are hunted for their teeth. Elephant’s tusks, or very large teeth growing on either

Elephants are perhaps the only animals that are hunted for their teeth. Elephant’s tusks, or very large teeth growing on either

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问题     Elephants are perhaps the only animals that are hunted for their teeth. Elephant’s tusks, or very large teeth growing on either side of their mouths, are composed of a valuable material called ivory(象牙).
    (77) An elephant uses its long, pointed tusks as tools for digging in the ground for food. He also uses them as weapons in combat.
    The tusks of male elephants are usually large and heavy. In Africa, female elephants have long, light tusks. In India and other parts of southern Asia, female elephants have small, short tusks or none at all.
    (78) Tusks in good .condition are in great demand, and may sell for as high as two thousand dollars or more. Because of this, large numbers of elephants have been killed. Some countries have initiated (开始) methods of trying to protect elephants. They have established elephant preserves, or areas of land set aside for herds of elephants where no one is allowed to harm them. Elephants on the preserves are safe from ivory hunters.
"this" in paragraph 4 probably refers to ______
选项 A、The tusks of male elephants are usually large and heavy.
B、Tusks in good condition are in great demand, and may sell for as high as two thousand dollars or more.
C、Elephants are perhaps the only animals that are hunted for their teeth.
D、An elephant uses its long, pointed tusks as tools for digging in the ground for food.
答案B
解析 根据原文，因为象牙需求很大，导致价格很高，所以大量大象被捕杀。
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