岩石的强度主要有( )。 A．抗压强度 B．抗拉强度 C．抗弯强度 D．抗扭强度

阅读理解。

      A man went to a fast-food restaurant to buy his lunch.

     "Hi,"a waiter said. "May I help you?"

     "I'd like a hamburger, large chips and a Coke,"the man said.

     "Is that for here or to go?"the waiter asked.

     "To go," the man said.

     The waiter put the man's lunch in a bag. The man took out his money and paid for his lunch.

     "Thank you," the waiter said. "Have a mce day. "

      The man took the bag and walked to a park.  He sat down and opened the bag.  He was surprised.

There was no hamburger or chips; there was only money in the bag-two thousand

dollars!  Where was the man's lunch?  Why was the money in the bag?

      The manager of the fast-food restaurant needed to go to the bank. He put two thousand

dollars in an envelope, He put it in a bag and put the bag down. The waiter gave the manager's

bag to the man by mistake. So the manager had a hamburger, chips and a coke, and the man had

two thousand dollars !

1. The man went to a restaurant to______.              

A. buy his lunch        

B. have a rest          

C. sell drinks        

D. cook food

2. The man wanted to have his lunch______.             

A. in a hotel          

B. in a shop            

C. in a restaurant      

D. in a park

3. When the man opened the bag, he found______in it.

A. food    

B. drink   

C. money   

D. nothing

4. How much money was there in the man's bag?

A. $ 100.    

B. $ 200.    

C. $ 100.    

D. $ 2,000.

5. ______ couldn't find his money.

A. The man    

B. The manager    

C. The waiter   

D. Nobody

有四支相同材料和相同厚度的玻璃量筒，其中a、b等高等截面积；b、c等高，b的截面积小于c的截面积，c、d不等高，但截面积相同，装有如上图所示的水。探究小组的同学们分别轻轻敲打来听音调的高低，从而探究空气柱发声的频率与空气柱的关系。

(1)科学探究的第一环节是___________________________________。

(2)若探究“空气柱越长，发声的音调越高”应选用_____（填字母代号）。本次探究得到的结论：________________________________________________________________________。

 (3)若选择的是b、c，则探究的是：________________________________________________。

 (4)若选择的是c、d，试猜想他们想探究的是：__________________________________________________________________________________________。

奥苏贝尔认为，接受学习是一种机械学习，而发现学习则是一种有意义学习。（　　）

泸沽湖的纳西族人至今仍然保持的婚姻制度是__________。

烟草专卖品准运证的申请方式一般分为（）种类型。

A、二

B、三

C、四

D、五