个人客户人民币速汇款业务的单笔汇款上限为（）元。A.5万元 B.10万元 C.20万

阅读理解。

     We have three players today. Each of them will tell us about himself. Let's welcome them.

     Earth(地球):I am the third planet (行星) from the sun. I have one moon (卫星). I have many

mountains. I give a home to lots of plants and animals. I have much water on me.

     Mars(火星):I am the fourth planet from the sun. I am a planet with high mountains. I have two

small moons. People call them Phobos and Deimos. I have a very high mountain. People call it

Olympus Mons.

     Mercury(水星):Well, I am the nearest planet to the sun. I am also the second smallest planet.

I don't have any moons. I am the fastest (最快的) of all the planets when I go around the sun. It

only takes me 88 earth days (One earth day is 24 hours). 

1. The underlined word "them" in the first paragraph refers to (指的是) _______.

A. the three planets        

B. moons

C. 88 earth days            

D. mountains

2. Earth is different from other planets in that_______.

A. it has a moon          

B. it has much water on it

C. it's the only planet of the sun

D. it's the only planet with mountains

3. According to the passage, where can we see the high mountain -Olympus Mons?

A. On the sun.          

B. On Mars.

C. On the earth.        

D. On Mercury.

4. How long does it take Mercury to go around the sun?

A. 24 hours.        

B. 88 hours.

C. 408 hours.        

D. 2112 hours.

5. What can we NOT learn from the passage?

A. Mercury has no moons.

B. Mercury is very near to the sun.

C. Mars goes around the earth.

D. Phobos and Deimos are moons of Mars.

若a+b=0，则a和b的关系为（　　）

A．相等

B．互为倒数

C．互为相反数

D．都为0

下列关于食品添加剂说法正确的是            

A．食品添加剂都是人工合成的化学品，都有副作用，不可食用。

B．味精也是食品添加剂

C．碘盐中加碘不属于食品添加剂

D．着色剂仅能使食品颜色鲜艳，不能改变营养，故不属于食品添加剂

具有生肌作用的药物有( )

A．乳香
B．没药
C．川牛膝
D．血竭
E．白及

氢冷发电机的工作原理是什么？