题目内容

The Internet is an open system，and most information is available to everyone．It is very important to add(74)to existing system for protecting the secret information．

A. Web pages
B. modem
C. security
D. network

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下图所示的微机主板的①处是(23)插槽，②处是(24)接口。

A. CPU
B. PCI
C. RAM
D. IDE

A．yetB．otherwiseC．evenD．though

A. yet
B. otherwise
C. even
D. though

To ______ the world peace has been one of the most crucial functions of the United Nations

A. sustain
B. maintain
C. contain
D. retain

房地产自然周期自然形成，资本流动对其影响较小。 ()

A. 正确
B. 错误