何种方法是应用散射光强度来对抗原进行定量测定的（） A.免疫散射浊度法 B.免疫透射

The field of medicine has always attracted its share of quacks and charlatans — disreputable women and men with little or no medical knowledge who promise quick cures at cheap prices. The reasons why quackery thrives even in modern times are easy to find.To begin with, pain seems to be a chronic human condition. A person whose body or mind "hurts" will often pay any amount of money for the promise of relief. Second, even the best medical treatment cannot cure all the ills that beset men and women. People who mistrust or dislike the truths that their physicians tell them often turn to more sympathetic ears.Many people lack the training necessary to evaluate medical claims. Given the choice between (a) a reputable physician who says a cure for cancer will be long, expensive and may not work at all, and (b) a salesperson who says that several bottles of a secret formula "snake oil" will cure not only cancer but tuberculosis as well, some individuals will opt for "snake oil".Many "snake oil" remedies are highly laced with alcohol or narcotic drugs. Anyone who drinks them may get so drunk or stoned that they drown their pains in the rising tide of pleasant intoxication. Little wonder that "snake oil" is a popular cure-all for minor aches and hurts! But let there be no misunderstandings. A very few "home remedies" actually work. However, most remedies sold by quacks are not only useless, but often can be harmful as well.

Quackery thrives even in modern times because________.

A．patients pay any amount of money

B．patients do not like their physicians

C．quacks say that they can help patients

D．best medical treatment costs very much

根据句意选词填空。注意每个单词的正确形式。

already,  play,   check,  one,    be

小题1:It’s a good idea _____________ your vocabulary notebook every day.

小题2:Spacecraft have __________ been to Mar.

小题3:The __________ prize is the holiday of your dreams in England.

小题4:–Where have you _________ these days?     --To Beijing.

小题5:The little boy practises ___________ the violin every day.

建筑材料，按其使用功能划分为建筑装修修饰材料、保温隔声材料、管道材料以及施工材料等。建筑材料的防火性能一般用建筑材料的（）来表述。

A．化学性能

B．耐火极限

C．燃烧性能

D．耐火性能

下述分子为E受体的是（）

A.CD2

B.CD4

C.CD8

D.CD25

E.CD28

尽管人类居住的地球有70.8%的面积被海洋覆盖着，全球藏水量约为13.7亿立方公里，可淡水只占2.53%。在所有的这些淡水中，又有68.7%储藏于南极和北极的冰川及永久性“雪盖”中，人类利用这些淡水资源仍需时日。由于对水资源的过量的盲目开采，肆意浪费和污染，人类可以利用的本来就很少的淡水资源便愈来愈少。 对上面一段话理解不正确的是( )。

A．由于淡水资源尚未充分开发，人类利用淡水资源的潜力巨大

B．目前地球上可以利用的淡水资源主要集中在南极和北极的冰川及永久性“雪盖”中

C．如果不能采取有效措施，人类将面临缺乏淡水资源的危机

D．盲目开采、肆意浪费和污染，使人类的淡水资源变得枯竭