下列属于金融衍生产品的是( )。A．股票B．债券C．股指期货D．活期存款

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     Yesterday was March 8th. It was    1    Day. After school, Jack left school quickly. He went    2    in the supermarket.

He    3    some food and fruits, and then went home. When he arrived home, he began to do the    4    for his mother. At

first he    5    the house.Then he did some    6    for his mother. After he finished his housework, he sat down to wait for

his    7   . Ten minutes    8   , his mother went home after work When she came home, Jack said to his mother, "    9   

women's Day! Mum. " His mother felt surprised and she was very impressed. She said to his son? " Thank you very

much. You're a good boy.  I am    10    of you. " Then they began to have supper happily.

1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____

对低值易耗品进行评估时，应考虑的因素是( )。

A．实际成本

B．实体性损耗

C．功能性损耗

D．经济性损耗

一类精神药品处方的颜色是

A．淡红色
B．淡黄色
C．淡绿色
D．淡蓝色
E．白色

某日16时10分，某厂维修班开始检修连接污油池的输油管线，16时20分钳工甲将带有底阀的输油管线放入污油池内，当时污油池内油的液面高度为50cm，上面浮有30cm厚的污油，在连接100cm高的法兰时，由于法兰无法对正而连接不上，班长乙去车间喊电焊工丙，17时10分电焊工丙带着电焊机到达现场，由于是油池附近作业，电焊工丙在现场准备好后，去车间办理动火票，17时20分，钳工甲见丙迟迟没有回来，快到下班时间，于是用电焊开始焊接，焊接3min左右，发生油气爆炸，爆炸将油池顶盖掀开，油池着火，钳工甲在油池附近死亡。
根据以上情形回答下列问题，1～3题为单选题，4～7题为多选题。

该事故中引起油气爆炸有关的因素有( )。

A．空气

B．油与不挥发的气体

C．环境温度

D．电焊焊接所产生的弧光

E．污油

The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth.
By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist.
Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.
After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface.

When the sun becomes a red giant, what will conditions be like on Earth

A．Its atmosphere will freeze and become solid.
B．It will be enveloped in the expanding surface of the sun.
C．It will become too hot for life to exist.
D．It will be nearly destroyed by nova explosions.