下列各项中属于利润表作用的有（） A.是预测现金流量的基础 B.了解企业负债总额及其

2009年5月4日，一种能快速检测出甲型H1N1流感病毒的试剂盒在军事医学科学院军事兽医研究所研制成功。这种全称为流感病毒RT-PCR的检测试剂盒，能特异性检测H1、H3、H5、H7、H9亚型流感病毒，可对甲型H1NI流感病毒进行特异性分型检测。这表明：

①规律是普遍的、客观的；②意识有能动作用；③物质是可知的；④人们可以认识并利用规律来造福人类。

A．①②③④　

B．①③④

C．②③④

D．①②③

各种防雷装置的接地装置每年在雷雨季节前检查一次。

（）保存价值的电子公文必须制成纸质公文与原电子公文的存储载体一同归档。

A.永久和长期

B.短期

C.长期和短期

Bad teeth can be painful -- and worse. They can even be deadly. Infections (感染) of the gums (牙龈) and the teeth can cause bacteria (细菌) to go into the blood system. Those bacteria can increase the chance of a heart attack and worsen the effects of other diseases. And adults are not the only ones at risk.

For example, in 2007, doctors in the Washington area said a boy died when a tooth infection spread to his brain. They said it might have been prevented had he received the dental care (牙齿保健) he needed. He was twelve years old.

Experts at the National Institutes of Health say good dental care starts at birth. Breast milk, they say, is the best food for the healthy development of teeth. Breast milk can help slow the growth of bacteria and acid production in the mouth.

But dentists say a baby's gums and early teeth should be cleaned after each feeding. Use a cloth with a little warm water. Do the same if a baby is fed with a bottle. Experts say if you decide to put your baby to sleep with a bottle, only give the child water.

When baby teeth begin to appear, you can clean them with a wet toothbrush. Dentists say it is important to find soft toothbrushes made especially for babies and to use them very gently.

The use of fluoride (氟化物) to protect teeth is common in many parts of the world. For example, it is often added to drinking water supplies. The fluoride mixes with enamel (珐琅质) , the hard surface on teeth, to help prevent holes from forming.

小题1:Which of the following can be used as the title of the passage?

A．Concerns for Healthy Teeth of the Young

B．Causes of Teeth Problem

C．Importance of Healthy Teeth of All

D．Solutions to Teeth Problem小题2:What's the main idea of paragraph 4 and 5?

A．How to develop babies' teeth.

B．How to keep babies' teeth clean

C．Why to protect babies' teeth

D．Why to keep babies' teeth clean小题3:The passage indicates that ______.

A．Enamel is most widely used to protect teeth in the world

B．Breast milk can cure babies' bad teeth

C．Bad teeth may affect the health of adults and the young

D．Babies' teeth should be brushed once per day小题4:The writer uses the boy's death as an example to show that ______.

A．not only adults but the young may suffer from teeth problem

B．the doctors should be responsible for the case

C．babies with bad teeth can easily die

D．the boy was not fed with his breast milk

女士穿（）走在不太平的路段或阶梯的时候，应步履平缓稳重。

A.高跟皮鞋

B.皮裙

C.连衣裙

D.深色长袜