简述1994年税制改革的必要性。

根据短文内容判断下列句子的正误，正确的用“A”，错误的用“B”。

       One afternoon Bob and Jane walked in a long quiet street. Then they heard a big noise from the

street corner. They ran there and found a small car knocked(敲)into the side of a truck. Both the car

driver and the truck driver were hurt.

       "Bob," said Jane, "Run back down the road to Mrs Day's house. Ask her to call the police and the

ambulance(救护车)．Hurry up! I'll stay here."

       Bob went off as fast as he could. Jane could do nothing but wait. She knew that when people were

hurt in an accident, we should not move them.

       It wasn't long before the police car and the ambulance arrived. The policemen got the car door open

and moved the man out. Then they got the trunk driver out. Luckily, the men weren't badly hurt, and the

ambulance took them to the hospital. The policemen thanked Bob and Jane, "You were very good to act

so quickly when you saw the accident:  Thank you for all your help."

( )1. The accident happened in a quiet street one afternoon.    

( )2. Bob, Jane, Mrs Day and the policeman heard the noise.    

( )3. Both of the drivers were hurt in the accident.  

( )4. Jane asked Bob to call the police.                    

( )5. It was a long time before the policemen arrived.          

下列蒸汽（）是二次蒸汽。

A、界外来的高压蒸汽

B、界外来的低压蒸汽

C、进第一效再沸器的蒸汽

D、蒸发系统一效顶出来蒸汽

底面边长为2，侧棱与底面成60°的正四棱锥的侧面积为______．

临时进入现场的载货车辆实行（）制度，驾驶人员交押“（）”，并借安全帽佩戴。

王老师在讲"果实"这个概念时，列举了苹果、花生等可食果实的例子，也列举了棉籽、橡树籽等不可食果实的例子。这种教学方法称为（）。

A.变式

B.范式

C.原型

D.演绎