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  3. The world’s rainforests cover less than ten percent of the earth’s surface, but contain over forty percent of all plant and anim

The world’s rainforests cover less than ten percent of the earth’s surface, but contain over forty percent of all plant and anim

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问题     The world’s rainforests cover less than ten percent of the earth’s surface, but contain over forty percent of all plant and animal species. The biggest rainforest is in South America, it’s called the Amazon.
    Amazon is by far the largest remaining rainforest area left on our planet. It’s about 6 to 7 million square kilometers. It’s about two-thirds the size of the United States including Alaska. It’s enormous. Sixty percent of it is in Brazil, but the rainforest also extends into Bolivia, Peru, Ecuador, Colombia, Venezuela, French Guiana and Suriname. And amazingly each year the Amazon provides twenty percent of the world’s fresh water. Here you can find at least 60-70 thousand plant species and at least 3 thousand species of fresh water fish. And more monkeys than you find anywhere else on earth. In Brazil alone nine new species of monkeys have been identified over the last year.
    But many of those species, known and unknown, are destroyed every day. Moreover, constant logging, mining and raising domestic animals cause a gradual disappearance of the Amazon jungles.
The word "constant" (Line 1, Para. 3) means ________.
选项 A、frequent
B、gradual
C、continuous
D、quick
答案C
解析 词汇题。题目询问第三段首行的constant是什么意思。词汇题一般可以根据句意和上下文推断出正确答案。因为“constant伐木、采矿和畜牧业导致了亚马逊丛林的逐渐消失”，由a gradual disappear“逐渐消失”可推断C项continuous(持续的，不停的)正确。A项frequent(频繁的)、B项gradual(逐渐的)和D项quick(快速的)都不能准确描述代木、采矿和畜牧业的无休止状态。
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