以标准[偏]差表示的测量不确定度，称为______。 A．扩展不确定度 B．标准不

下列关于国内期货集合竞价说法正确的有（）。

A.采用最大成交量原则

B.交易系统依照最大成交量原则逐步将排在前面的买入申报和卖出申报配对成交，直到不能成交为止

C.开盘价集合竞价在某品种某月份合约每一交易日开市前5分钟内进行

D.开盘集合竞价中的未成交申报单不参与开市后竞价交易

下列关于企业外部融资额的计算公式正确的是（）。

A.预计经营资产-预计总负债-预计股东权益

B.净经营资产增加-可动用的金融资产-留存收益的增加

C.经营资产增加-经营负债增加-留存收益的增加

D.预计总资产-负债自然增加-预计股东权益增加

下表是元素周期表的一部分，请从下表①～⑩十种元素中选择适当的元素回答下列问题：

（1）写出元素⑤原子的核外电子排布式  ▲ ，⑥与①形成的10电子阴离子的电子式▲ ；

（2）已知某些不同族元素的性质也有一定的相似性，如元素③与⑧的氢氧化物有相似的性质，写出元素③的氢氧化物与NaOH溶液反应的离子方程式       ▲     ；

（3）元素⑨形成的单质中存在的化学键为       ▲           ；

（4）物质熔沸点的高低与该物质的晶体结构有关，④的单质晶体熔点为2573K，沸点2823K，硬度大，则属于  ▲    晶体。某同学猜想⑧和⑩形成的化合物B晶体类型与NaCl相同，现用实验证明上述猜想是否正确，你的实验方案是            ▲          。

More than 2 million US teenagers have suffered a serious bout（发作) of depression in the past year, according to a federal government survey released on Tuesday.

On average, 8.5 percent of adolescents aged 12 to 17 described having had a major depressive episode in the previous year, the Substance Abuse and Mental Health Services Administration reported.

But there were "striking differences" by sex, with 12.7 percent of girls and 4.6 percent of boys affected.

Depression is the leading cause of suicide, which in turn is the third-leading cause of death for 15- to 24-year-olds in the United States.

"Combined 2004 to 2006 data show that rates of past year major depressive experience among youths aged 12 to 17 generally increased with increasing age," the researchers wrote.

Researchers at SAMHSA and RTI International in Research Triangle Park, North Carolina, prepared the report using data from the National Survey on Drug Use and Health.

More than 67,700 youths aged 12 to 17 answered questions about mood and depression. They were also asked to rate how depression affected them using the Sheehan Disability Scale, which measures impact on family, friends, chores at home, work and school.

Researchers defined a major depressive episode as two weeks or longer of depressed mood or loss of interest or pleasure, and at least four other symptoms(症状) such as problems with sleep, energy, concentration or self-image.

Nearly half of the teenagers who had major depression said it severely damaged their ability to function in at least one of the areas on the disability scale.

"Fortunately, depression responds very well to early intervention and treatment," SAMHSA Administrator Terry Cline said in a statement.

63. The underlined word “ episode ”in paragraph 2 has the similar meaning as the given word   

A. experiment B. feeling C. expression   D. experience

64. The main reasons which lead to serious depressive symptoms include     .

A. no family or friends or jobs or interests at all

B. low spirits , unhappiness , lack of sleep and poor concentration

C. poor health , sex discrimination , less energy and loss of interest

D. suicide , sandness , lack of confidence and depression

65. What can be implied , but is not stated directly ?

A. depression is the third-leading cause of suicide

B. There were more girl students suffering depression than boys

C. There were over 2 million American teens suffering depression in the past two years

D. The students surveyed were aged between `12 and 17

66. What will the following paragraph probably talk about according to the passage ?

A. How to recover from stress         B. How to prevent and treat depression

C. How to live a comfortable life     D. How to have a happy feeling

受体放射分析与放射受体分析的比较，两种分析法的不同处是（）

A.标记配体

B.生物活性

C.受体的性质

D.结合原理

E.分析目的