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问题 选择题

两个素数相乘的积（　　）

A．一定是素数

B．一定是奇数

C．一定是偶数

D．一定是合数

答案

两个素数的积的因数除了1和它本身外，还有这两个因数，

根据合数的意义可知，两个素数的积一定是合数．

故选：D．

问答题

Passage 2 Korea, once known as the “Hermit Kingdom” , is plainly on the move. As with “Japan, Inc.” before it, the new label “Korea, Inc.” may be no more than a trendy buzzword. But South Korea aims to forge just such a national economic machine, using the might of its established giants backed by centralized planners who can mobilize the country’s banks and industrial infrastructure. The heady dreams of actually rivaling Japan may never come within reach; Korea’s economy, while large by Asian standards, is barely one-fifteenth the size of its island neighbor. And it faces a gantlet of other obstacles, ranging from an unwieldy bureaucracy and a volatile political climate to a chronic shortage of investment capital and heavy commitments to military spending. Still, the comparisons with Japan, Inc. are more than empty flattery; in fact, they signal Korea’s gathering clout.

What is a “Hermit Kingdom”
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单项选择题

下面哪一种CT表现有利于脑外占位病变的诊断（）

A.病变边缘不清

B.病变与骨板交界呈锐角

C.病变内有钙化

D.邻近蛛网膜下隙增宽

E.同侧脑室变窄移位
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