1， 5， 7， 17， ( )。A．29 B．31 C．33 D．37

     Have you ever had the experience of drinking water that was just boiled(煮沸的)? It hurts you because it's too hot. But if you wait too Iong, the water may get cold.    

     Can you find a bottle that you can drink water comfortably but can'l be hurt by the hot water.  

Scientists found drinking 40-degree water is best for our health. Now a girl has found the bottlc. She is a

middle school student named Xiang Zeyu. She  is  from Xi'an, Shaanxi.  She is studying at Xi'an Aizhi

Midclle School.  The 15-year- old girl came up with the idea when she heard her younger sister complain

that her boiled water was toohot or too cold to drink. She decided to make all inveIltion that could tell the proper time to drink the boilecl watu. Xizing and her classmate Li Jingyi first bought a tem lierature

detector(检测器)that had been set to sense the temperature at 40 degrees.  Then they connected(连接)it

to a music chip,a switch(开关)ancl a can with electric wires(电线)．After they cov- ered the can with a

bigger bottle, their invention was ready.  Powered by two AAA batteries(电池),the bottle works well. "

Pour the boiled water into the bottle and turn on the switch, then wait. The bottle will begin to sing when

the temperature is right 40 degrees," Xiang said. rro invent this bottle, Xiang and her classmate spent ~50

and one whole week of their spare time. 

1.  How many degrees of water is best for our body?       

A. 40.              

B. 45.          

C. 80.        

D. 50. 

2.____invented the bottle.     

A. A 15-year-old boy        

B. Xiang Zeyu        

C. Xiang Zeyu and her classmate        

D. Xiang Zeyu's classmate  

3. Why did Xiang zeyu invent the bottle?       

A. She was hurt by boiled water.       

B. Her classmate was hurt by boiled water.        

C. Her younger sister complained.the boiled water.        

D. Her younger sister was hurt by the boiled water. 

4. How much did Xiang and her classmate spend on the invention7      

A.  ￥40.          

B.  ￥50.        

C.  ￥30.      

D.  ￥90. 

5. What things did they use to make the bottle?        

A.  A temperature detector,a music chip,a can with electric wires,a switch,a bottle and two AAA

      batteries.        

B.  A temperature detector,  a music chip,  a can with electric wires, and two AAA batteries.        

C.  A temperature detector,a can with electric wires,  a bottle and two AAA batteries.        

D.  A temperature detector,  a music chip,  a can, and two AAA batteries.

地球上的岩石可以分为火成岩、沉积岩、变质岩。由硅酸盐溶浆凝结而成的火成岩构成了地壳的主体，按体积和重量计算都最多。但地面最常见到的则是沉积岩，它是早先形成的岩石破坏后，又经过物理或化学作用在地球表面的低凹部位沉积，经过压实、胶结再次硬化，形成具有层状结构特征的岩石。在地壳中，在大大高于地表的温度和压力作用下，岩石的结构、构造或化学成分发生变化，形成不同于火成岩和沉积岩的变质岩。 这段文字主要介绍了地球上各类岩石的( )。

A．形成条件

B．结构特征

C．地质分布

D．化学成分

大气中各种云状的产生，主要是空气下降运动的形式不同而造成的。

某企业于年初向银行借款1600万元，其年有效利率为12%，若按月复利计息，则该年第3季度末借款利息是本金的（）。

A.7.5%

B.8.87%

C.7.75%

D.8.75%

有机磷中毒时，下列哪种酶活性明显降低

A．ALT

B．LDH

C．CK

D．ALP

E．pCHE