世界最大的山系是[ ] A．科迪勒拉山系 B．阿尔卑斯山系 C．喜马拉雅山系 D

测定溶解氧的水样应在现场加入（）作保存剂。

A、H3PO4

B、HNO3

C、MnSO4和碱性KI

D、2.5%的EDTA溶液

How far would you be willing to go to satisfy your need to know？Far enough to find out your possibility of dying from a terrible disease？These days that’s more than an academic question，as Tracy Smith reports in our Cover Story.

There are now more than a thousand genetic(基因的) tests，for everything from baldness to breast cancer，and the list is growing.Question is，do you really want to know what might eventually kill you？For instance，Nobel Prize­winning scientist James Watson，one of the first people to map their entire genetic makeup，is said to have asked not to be told if he were at a higher risk for Alzheimer’s(老年痴呆症)．

“If I tell you that you have an increased risk of getting a terrible disease，that could weigh on your mind and make you anxious，through which you see the rest of your life as you wait for that disease to hit you.It could really mess you up.” said Dr.Robert Green，a Harvard geneticist.

“Every ache and pain，” Smith suggested，could be understood as “the beginning of the end.”“That’s right.If you ever worried you were at risk for Alzheimer’s disease，then every time you can’t find your car in the parking lot，you think the disease has started.”

Dr.Green has been thinking about this issue for years.He led a study of people who wanted to know if they were at a higher genetic risk for Alzheimer’s.It was thought that people who got bad news would，for lack of a better medical term，freak_out.But Green and his team found that there was “no significant difference” between how people handled good news and possibly the worst news of their lives.In fact，most people think they can handle it.People who ask for the information usually can handle the information，good or bad，said Green.

小题1:The first paragraph is meant to________.

A．ask some questions

B．introduce the topic

C．satisfy readers’ curiosity

D．describe an academic fact小题2:Which of the following is TRUE of James Watson?

A．He is strongly in favor of the present genetic tests.

B．He is more likely to suffer from Alzheimer’s disease.

C．He believes genetic mapping can help cure any disease.

D．He doesn’t want to know his chance of getting a disease.小题3:According to Paragraphs 3 and 4，if a person is at a higher genetic risk，it is________.

A．advisable not to let him know

B．impossible to hide his disease

C．better to inform him immediately

D．necessary to remove his anxiety小题4:The underlined part “freak out” in Paragraph 5 is closest in meaning to “________”．

A．break down

B．drop out

C．leave off

D．turn away

入警大学生岗前培训工作要着力培养入警大学生的（）能力。

A.部队管理教育能力

B.灭火救援组织指挥能力

C.组训施训能力

D.火灾防控能力

装配曲轴，要检查曲轴的轴向间隙，止推垫片有减摩合金的一边应对准曲轴相应断面。

（）能最准确地计算活动的历时（AD）。

A.AD=工作量／人员生产率

B.AD=工作量／人力资源数量

C.AD=（最乐观时间+4最可能时间+最悲观时间）／6

D.AD=人员生产率×项目规模