下列物质的名称、俗名与化学式完全对应的是（ ） A．乙醇酒精CH3COOH B．

阅读理解。

     One Sunday morning Mr Green and his son, Bill are in a supermarket. The boy is only five years old.

  Mr Green wants to buy a new blouse for Mrs Green . Bill likes oranges , so his father buys two kilos (公

 斤) of oranges for him. Bill also wants to buy some comic books and colour pencils. He asks his father,

  "Dad, can you buy me some comic books and colour pencils?" "Of course, but what do you do with

  them?" Father asks. "My classmates have many, I want many, too." Mr Green is happy to buy some for

  his son.

1. Mr Green goes to the shop with _____.

    A. Mrs Green  

    B.  his son   

    C. his cousin

    D. his father

2. Mr Green wants to buy a new blouse for _____.

    A. Bill's mother  

    B. Bill      

    C. his friend

    D. Bill's sister

3. Bill likes _____.

    A. ice creams

    B. the new blouse

    C. oranges

    D. orange

4. Bill wants to buy _____.

    A. some comic books              

    B. some colour pencils

    C. T-shirt in the shop              

    D. A and B

5. Mr Green is _____ to buy his son some comic books and colour pencils.

    A. happy          

    B. sad        

    C. excited    

    D. sorry

下列科技成就属于我国科技工作者排除“ * * ”错误干扰，坚持科学探索而取得的是

①第一颗原子弹爆炸成功               ②第一颗人造卫星发射成功

③袁隆平成功培育出籼型杂交水稻       ④载人航天取得突破性成就

A．①③④

B．②③

C．②③④

D．①②③

（）下列哪个不是“紧固件”选项中“垫圈”的分类？

A.平垫圈

B.方形垫圈

C.弹簧垫圈

D.其他

流行病学实验研究中，控制信息偏倚力度最大的试验设计是

A．开放试验

B．自然试验

C．单盲试验

D．双盲试验

E．三盲试验

为了确保导游服务质量，既保护游客的（），又树立旅游目的地国家、地区和旅游企业的（），世界许多国家的政府部门或有关机构、组织都加强了对导游人员的管理，并将这种管理纳入了法制化轨道。