关于外阴癌，下述错误的是A．外阴鳞状细胞癌最常见 B．外阴癌分为原发性和继发性两类，

核医学影像与其他影像比较，其优势是（）

A.可以反映氢核密度的变化

B.可以反映代谢、血流和功能改变

C.可以反映密度的变化

D.可以反映回声的改变

E.空间分辨率更高

为测定空气中氧气与氮气的体积比，某同学设计了如图所示的装置进行实验．具体操作是：先关闭弹簧夹；再将螺旋状的铜丝在酒精灯上灼烧后，迅速插入大试管接触试管底部的白磷（过量）；然后立即塞紧橡胶塞．他观察到大试管中产生大量的白烟．请你帮他解答下列问题：

（1）写出白磷燃烧的化学方程式______．

（2）待试管冷却后打开弹簧夹，此时可观察到的现象为______，产生该现象的原因是______．

（3）如果装置气密性不好，测出氧气与氮气的体积比将______（填偏大、偏小、不变）．

LONDON (Reuters) — Children are dying for lack of drugs tailored to their needs, according to the World Health Organization (WHO), which launched a global campaign on Thursday to promote more research into child medicine.

More than half of the drugs currently used to treat children in the industrialized world have not been specifically tested on youngsters.

The problem is even worse in developing countries where price remains a major barrier and 6 million children die each year from treatable conditions.

In the case of HIV/AIDS, the few existing pediatric therapies（儿科的疗法）developed for children generally cost three times more than adult ones.

As a result, clinicians lack clear guidelines on the best drug to use and often have to guess at the correct dose.

Fortunately, the WHO has drawn up the first international List of Essential Medicines for Children, containing 206 products considered safe for children.

“But a lot remains to be done. There are priority medicines that have not been adapted for children’s use or are not available when needed,” said Dr Hans, the U.N. agency’s director of medicines policy and standards.

Medicines that need to be adapted to children’s needs include many antibiotics, pain drugs as well as combination pills for HIV/AIDS, tuberculosis and malaria.

The agency is building an Internet entrance linking to clinical trials carried out in children and will launch a Web site with the information early next year.

Testing medicines on children has always been a controversial issue, since good ethical（伦理的）practice requires informed agreement from people participating in clinical trials, which is difficult to obtain in the case of children.

As a result, research-based drug companies have been wary of developing child-friendly medicines and general companies have been slow to produce them at lower cost.

In an attempt to deal with the issue, both Europe and the United States now have special rules offering extended patent protection for drugs that have been tested on children.

小题1:Which of the following is the best title of the passage?

A．A Global Campaign to Promote Research into AIDS Medicine

B．WHO Says Children are Dying for Lack of Child-sized Drugs

C．Many People are Concerned about Children’s Drugs

D．Measures Taken to Develop Child-friendly Medicine Quickly小题2:Which of the following medicine is not needed to be adapted to children’s need according to the passage?

A．Pain killers.

B．Tuberculosis.

C．AID pills.

D．Flu pills.小题3:Why has testing medicines on children always been a controversial issue?

A．It is against good ethical practice

B．Children shouldn’t take part in clinical trials.

C．It is hard to get informed agreement from children tested.

D．Parents don’t allow their children to be tested on medicine.小题4:The underlined word “wary” in the last but one paragraph means _________.

A．fast

B．fond

C．cautious

D．uninterested小题5:What can be inferred from the passage?

A．There is still a long way to go on children’s medicine.

B．An Internet entrance is being built to link to clinical trials carried out in children.

C．Both Europe and the United States now have special rules offering extended patent protection for children’s drugs.

D．Less than half of the drugs currently used to treat children in the industrialized world have not been specifically tested on youngsters

下列各数中最小的是（）。

A、十六进制数1A

B、二进制数10101

C、十六进制数B

D、十进制数25