存款人撤销备案类银行结算账户，不需要提供的内容是：（）A、单位介绍信 B、核对银行结算

American researchers have developed a technique that may become an important tool in fighting AIDS virus from attacking its target-cells in the body's defense system．When AIDS virus enters the blood，it searches for blood cells called T4 lymphocytes(淋巴细胞)．The virus connects to the outside of T4 lymphocytes．Then it forces its way inside．There it directs the cells' genetic material to produce copies of the AIDS virus．This is how AIDS spreads．

Researchers think they may be able to stop AIDS from connecting to T4 ceils．When AIDS virus finds a T4 cell，it actually connects to a part of the cell called CD4 protein．

Researchers want to fool the virus by putting copies or clones of the CD4 protein into the blood．This way the AIDS virus will connect to cloned protein instead of the real ones．Scientists use genetic engineering methods to make the clones．Normally a CD4 protein remains on the T4 cell at all times；the AIDS virus must go to it．

In a new technique，however，the cloned CD4 protein is not connected to a cell．It floats freely，so a lot more can be put into the blood to keep the AIDS virus away from real CD4 protein on T4 cells．One report says the．AIDS virus connects to cloned protein just as effectively as it connects to real protein．That report was based on tests with blood cells grown in labs．The technique is just now beginning to be tested in animals．If successful，it may be tested in humans within a year．

小题1:The new technique can     .

A．cure AIDS

B．kill the AIDS virus

C．prevent the AIDS virus from spreading

D．produce new anti-AIDS cells小题2:When the AIDS virus enters the blood，it is reproduced by     .

A．itself

B．the blood cells

C．the CD4 protein

D．the genetic material of T4 lymphocytes小题3:The AIDS virus connects to cloned protein instead of the real CD4 protein because    .

A．cloned protein stays On the T4 cells

B．it connects to cloned protein more effectively

C．cloned protein is made by genetic engineering methods

D．cloned protein floats freely，and many more can be put into the blood小题4:Which of the following statements is NOT true?

A．The new technique has been tested in labs．

B．The new technique is being tested in animals．

C．The new technique may be tested in humans．

D．The new technique is now under clinic test．小题5:The best title for this passage is     ．

A．AIDS-a deadly disease

B．A new technique in fighting AIDS

C．The spread of AIDS virus

D．The cloned CD4 protein

关于三环类抗抑郁药物（TCAs）的副作用，以下哪项描述不对（）

A.抗胆碱能副作用是TCAs治疗中最常见的副作用

B.TCAs可以诱发癫痫

C.TCAs的奎尼丁样作用可能与药物所致的心律失常有关

D.超量服用或误服可发生严重的毒性反应，危及生命

E.不引起过敏反应

各单位应建立健全听力保护记录，听力保护记录应至少保存10年。

暑期，（）在执行职务时，可不戴帽子。

A、客运员、行李员

B、站长

C、客运主任

D、客运值班员

点蚀是金属材料处于含氯离子较高的酸性介质溶液中，由于材料本身与其内部所含沉淀的杂质之间的电位差而形成的（）腐蚀。

A.电化学

B.电物理

C.化学

D.应力