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问题 单项选择题

以下哪项不是判断腹泻患儿中重度脱水的重要依据（）。

A.眼窝、前囟深陷

B.皮肤干燥、弹性差

C.循环差，有休克前期表现

D.血钠浓度低

E.尿量少

答案

参考答案：D

解析：血钠浓度可判定脱水性质，不能衡量脱水程度。

选择题

读下图，完成1—3题。

1、关于图示地区的说法，正确的是

    ①西北坡较陡，东南坡较缓 ②地势起伏大，属山地

    ③山地走向为东北—西南向 ④最大高度差不大于250m [ ]

A、①②

B、②③

C、③④

D、①④

2、如果图示地区在我国东部，则该地区 [ ]

A、可能位于江南丘陵，生态问题表现为水土流失

B、植被为落叶阔叶林，生态问题表现为水土流失

C、可能位于江南丘陵，植被为落叶阔叶林

D、土壤有机质比重大，植被为落叶阔叶林

3、随着经济的发展，甲地城镇化进程加快。甲地区位优势有[ ]

A、位于山地缓坡，交通运输较便利

B、交通运输较便利，农业较为发达

C、处于山地背风坡，农业较为发达

D、交通运输较便利，处于山地背风坡

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单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (46) from a friend who asks you to open it. This is what happens with Melissa and several other similar E-mail (47) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (48) .

A. virtualB. virus C. worms D. bacteria

As administrators seek to block dangerous email attachments through the recognition of well-known (49) , virus writers use other extensions to circumvent such protection. Executable (.exe)files are renamed to. bat and. cmd plus a whole list of other extensions and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (50) access to your network.
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