亲缘关系相近的物种，因遗传基础比较接近，往往发生相似的基因突变，这种现象称为（）。

某股票的β值是1.5，市场组合的年预期收益率为15%，无风险利率为6%，则该股票的预期年回报率是( )。

A．(A) 19.5%

B．(B) 13.5%

C．(C) 21%

D．(D) 22.5%

The Antarctica is actually a desert.

The Antarctica is all ice all the year. The warmest temperature ever recorded there is zero at the South Pole. Explorers(探险家) used to think that a place so cold would have a heavy snowfall. But less than ten inches of snowfalls each year. That is less than half an inch of water. Ten times that much moisture(水分) falls in parts of the Sahara.

The little snow that falls in Antarctica never melts(融化). It continues to pile up deeper and deeper year after year and century after century. When the snow gets to be about eighty feet deep, it is turned to ice by the weight of the snow above it.

1. Antarctica is called a desert because it _____.

A. is sandy

B. has the same temperature as a desert

C. has little moisture

D. all of the above

2. The Antarctica has _____.

A. ten times as much moisture as the Sahara

B. the same amount of moisture as the Sahara

C. about one-tenth the moisture of the Sahara

D. none of these

3. The snow in Antarctica is very deep because it _____.

A. never stops falling

B. piles up year after year

C. never melts

D. Both B and C

4. The best title for this passage is “_____”

A. A Strange Continent

B. The Antarctica—An Ice Desert

C. Snowfall at the South Pole

D. The World’s Greatest Desert

在氢原子中，电子绕核在各个可能轨道上运动的能量，包括电势能和动能两部分，当电子从离核较近的轨道向离核较远的轨道跃迁过程中（     ）

A．电势能增大，动能减小，原子能量不变

B．电势能增大，动能减小，原子能量减小

C．电势能增大，动能减小，原子能量增大

D．电势能增大，动能增大，原子能量增大

下列关于干粉灭火器适用范围叙述错误的是（）。

A、干粉灭火器适于扑救石油及其产品易燃液体、可燃气体的初起火灾

B、干粉灭火器不适于扑救油漆等易燃液体初起火灾

C、干粉灭火器适于扑救电气设备初起火灾

D、工厂、学校、商店、车辆、船舶、科研部门、图书馆等单位可选用干粉灭火器。

(由单选和多选组成。)

贾某暴力抗税的行为应当如何处理( )。

A．贾某的暴力抗税行为构成抗税罪

B．贾某造成税务人员重伤的行为属于同一行为触犯两罪名的想象竞合，以故意伤害罪论处

C．对贾某应当按照抗税罪和故意伤害罪数罪并罚

D．贾某先前因违章建房而受到的行政拘留可以折抵刑期