老视初戴者的特点为（）。A、能适应光学透镜弧面像差 B、泪液的层次结构和成分对接触镜

读一读，回答问题。

Dear mom and dad,

      We got to the Sunnytown last night. Uncle Sam went to the station to meet us. We had a nice sleep and now

we are sitting next to the window and eating lunch with uncle and aunt.

      Their house is near the amusement park. We can see it through the window. But after lunch we will not

go to amusement. park. We will go to the zoo first and we will ride horses in the zoo! Then we will visit the

museum and we will eat dinner in a restaurant. We will eat my favourite food: fried rice with fruit! 

      It is time to go now. We will write to you again soon!

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Yours Emma & Justin

1. When did Emma and Justin get to the Sunnytown?

_______________________________________________________________________

2. What are they doing now?

_______________________________________________________________________

3. Where is uncle Sam's house?

_______________________________________________________________________ 

4. What will they do first in the afternoon?

_______________________________________________________________________

5. Will they go to the amusement park?

_______________________________________________________________________ 

6. Where will they eat dinner?

_______________________________________________________________________

声音在介质中以______的形式传播；物理学中把声音的______叫音调．

体重为75kg成年男子的血液总量范围是（）.

A．2～3升 

B．3～4升 

C．4～5升 

D．5～6升 

E．6～7升

各发供电企业应建立健全技术资料档案（）