下列表示中，正确的是（ ） A．∅={0} B．∅∈{0} C．∅⊆{0} D．0∈∅

读下面这段文字，根据拼音写出相应的汉字。

　　微笑着，去唱生活的歌谣。把尘封的心胸chǎng（1）_______开，让狭隘自私淡去；把自由的心灵放飞，让豁达kuān（2）_______容回归。这样，一个多zī（3）_______多彩的世界就会在你的眼前层层打开：蓝天，白云，小桥，流水……一路过去，鲜花的芳香就会在你的鼻间醉人地萦rào（4）_______，华丽的彩蝶就会在你的身边曼妙地起舞。

设f(x)在区间[a，b]上连续，在(a，b)内可导，f’(x)＞0，存在。证明： (Ⅰ) 在(a，b)内有f(x)＞0； (Ⅱ) 存在ξ∈r(a，b)，使得 (Ⅲ) 存在η∈(a，b)，使得

阅读下面的短文,  然后按照要求写一篇150词左右的英语短文。

     News report: Four young female college students died on Friday after falling or jumping from a

blazing room on the sixth floor of Shanghai Business School. Witness said one woman who jumped

appeared to be aiming for bushes on the ground, but missed and landed on concrete. Witnesses said

the other three were desperately trying to climb to another room amid roaring flames when they fell to

the concrete paving.

     The fire broke out in Room 602 of the sevenfloor dormitory at the school's downtown campus on

Zhongshan Road West, just after 6 am. The fire was caused by an electrical device used to heat water.

This had ignited flammable objects, police said late Friday afternoon. After receiving reports of the fire

at 6: 12 am, police, firefighters and ambulances were quickly on the scene. The fire was extinguished

by 6: 30 am, according to the school.

     There is only one public toilet on each floor to get water and fire extinguishers in the dormitory were

outdated, students said.

[写作内容]

1. 以约30个词概括这篇报道的主要内容；

2. 以约120个词针对此篇报道发表你对校园安全问题的看法,   至少包括以下内容要点：

(1)作为学生,  我们该如何在危急的状况下保护好自己；

(2)作为校方应该采取哪些措施避免此类悲剧的发生。

[写作要求]

1. 作文中可使用实例来支持你的观点,  也可以参照阅读材料的内容,  但不得直接引用原文中的句子；

2. 作文中不能出现真实姓名和学校名称。

[评分标准]

概括准确,  语言规范,  内容合适,  篇章连贯。

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绩效评价在专业技术人员激励中的应用主要有（）。

A.评价

B.区分

C.反馈

D.管理

按网络的交换方式分类有三种：（）。