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问题 选择题

下列各数中，最小的是（ ）

A．－２　

B．－３　　　

C．０　　　

D．６

答案

B

分析：先根据正数大于0，负数小于0，正数大于负数排除C，D；再由两个负数，绝对值大的反而小，得出结果．

解：∵四个答案中A，B都小于0；C是0，D大于0，

∴排除C，D，

又∵|-2|＜|-3|，

∴-3最小．

故选B．

点评：本题很简单，只要熟知正数都大于0，负数都小于0，正数大于一切负数，同为负数时绝对值大的反而小．

填空题

脊髓灰质炎的传染源是____________；主要传播途径为__________。
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单项选择题

All of these applications will enhance the (130) of life and spur economic growth. Over half of the U.S. work force is now in jobs that are information (131) . The telecommunication and information sector of the U.S. economy now (132) for 12 percent of the Gross Domestic Product, growing much faster than any other sector of the economy. Last year the (133) in this sector exceeded 700 billion dollars. The U.S. exported over 48 billion dollars of telecommunication equipment (134) .

A．quantity

B．quality

C．mass

D．amount
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