终端盒维护性能指标：（）A．应放置于机房地面，便于跳纤 B．放置在架空地板下的终端盒

如图示，是小明和小华在观察“水的沸腾”实验中的情景，通过酒精灯对水加热，使水沸腾，他们记录的数据如下表所示：

（1）实验中除了需要温度计外，还要测量时间的工具是______．

（2）继续实验，观察到水沸腾时的现象如图中的图______（选填“甲”或“乙”），水沸腾时吸收热量，温度______（选填“升高”、“不变”或“降低”）．

（3）本次实验中水沸腾时的温度为______．

（4）根据记录在图中画出水的沸腾图象．

（5）实验中发现，水从开始加热到沸腾的这段时间过长，造成这种现象的原因可能是：______，（写一种原因）

下列各项中，会引起事业单位年末资产负债表中事业基金总额发生变化的有（）。

A.购入3年期国债

B.以银行存款购入固定资产

C.提取职工福利基金

D.将闲置固定资产对外投资

We’re surrounded by chemistry in everyday life. Sometimes it is easy to see, like when your science teacher does a big experiment in class. At other times, it can be pretty hard to see everyday chemistry at work, but nearly everything you touch or use has some element of chemistry in it.

Something as simple as toothpaste contains at least three chemicals, if not more. It is the mixture of them and its chemical reaction that keeps your teeth clean. Other things you use every day are created by chemistry, such as hair products, shampoo and soap. Adding detergent (洗涤剂) to water involves chemistry. Without chemistry, we would never have known that we need soap to get the oil out of clothes or skin. Chemistry not only helps us make products for use, but it also helps us understand the world around us. Chemistry helps us understand what the ozone layer (臭氧层) is and how it protects us. Chemistry also gives us sunscreen to protect us from the sun. Thanks to chemistry, we know bleach (漂白剂) can’t be mixed with vinegar(醋), because it can produce poisonous gas.Without chemistry, we wouldn’t have fireworks displays on important days.

Chemistry plays a big role in food preparation. Cooking food causes it to go through a chemical change. That is why cooked food often tastes different from raw food. Baking is a great example of chemistry. Too much or too little of any ingredient（成分，尤指烹饪） makes a difference to the result of baking, for example, the dough (面团) won’t rise or the cake will be flat.

Chemistry isn’t something that just lives in a lab; it’s something that you meet hundreds of times every day. Knowing how chemistry works will give you a greater understanding of the science behind some of the simplest-looking things.

小题1:What’s the main idea of Paragraph 1?

A．Chemistry is easy to see around us.

B．Sometimes chemistry is hard to see around us.

C．How a science teacher does a big experiment.

D．Few things in everyday life contain chemistry.小题2:The following actions are about chemistry EXCEPT _____.

A．cleaning teeth with toothpaste

B．washing hair with hair products

C．using soap to get the oil out of clothes

D．washing your face with water小题3:The underlined word “poisonous” in Paragraph 3 means _____.

A．harmful

B．healthy

C．fresh

D．pleasant小题4:Which one is TRUE according to Paragraph 4?

A．One can’t find chemistry when cooking food.

B．Chemistry plays an important part in food mak-ing.

C．That dough rises is nothing to do with chemistry.

D．A flat cake is the result of too many ingredients.小题5:Which of the following would be the best title for the text?

A．Chemistry Around the House

B．Chemistry in Science

C．Chemistry for Dinner

D．Chemistry in everyday life

按照无牙颌组织结构特点，后堤区属于（）

A.主承托区

B.副承托区

C.边缘封闭区

D.缓冲区

E.上颌硬区

关于中国教育科研计算机网（CERNET），下列说法不正确的是（）。

A.它连结了国内许多高校

B.它不能被教育系统外的用户访问

C.它是Internet的一部分

D.它的用户主要是高校和科研机构中的学生和工作人员