格利—巴利综合征的主要表现 A．四肢对称弛缓性瘫痪 B．一侧中枢性面瘫 C．四肢肌萎

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     Hello, I am Tom Green.  I am from  the USA.  Dick White is our teacher.  He is from England. He

teaches us English. He teaches well. Hi's classes are very interesting. Mr White is good with us, but he

is also very strict with us.

     Mr White has three kids. Mona and Lucy are his daughters. And Bill is his son.  Mona is nine years

old. Bill is seven years old. Lucy is  only  one year old.  Mona and  Bill go to school.  But Lucy doesn't.

Hergrandmother looks after her at home.

     Mr White likes to wear a T-shirt and jeans. He likes sports.  His favorite sport is basketball. After

school we usually have a soccer match.  Sometimes(有时)  Mr Green watches us play and sometimes

he joins us.  He plays soccer just for fun.

1. Tom Green is __________.  

A. a Chinese student        

B. an English student

C. an American teacher      

D. an American student

2.How may sons does Mr White have?

A.One          

B. Two.        

C.Three            

D. Sorry, I don't know.

3.Lucy  doesn't go to school because __________       

A.she is too young(小)

B. she doesn't like to go to school

C. her father doesn't like her to go to school

D.  she thinks school is too difficult

4. __________is  Mr White's favorite sport.

A. Soccer    

B. Baseball  

C. Tennis  

D. Basketball

5. Which of the following is RIGHT?    

A. Mr White doesn't like his students.

B. Mr White is not strict with his students.

C. Mr White plays basketball just for fun.

D. Sometimes Mr White joins his students in their soccer ball matches.

钠和氯气反应生成氯化钠的化学方程式为2Na+Cl₂=2NaCl，反应的示意图如图所示．则下列结论不正确的是（　　）

A．构成物质的粒子有原子、分子和离子

B．化学反应中原子得到或失去的是能量低的电子，并形成相对稳定结构

C．化学反应前后元素种类没有改变

D．元素呈现的化合价与反应中元素原子得失电子及数目有关

若多项式x²-5x+4=（x+a）（x+b），则a=______，b=______．

我国标准规定加速器移动束治疗的稳定性的检定周期为（）

A.每日

B.每周

C.每月

D.每半年

E.每年

对免疫过程的多个环节有抑制作用的药物是（）

A.环磷酰胺

B.肾上腺皮质激素

C.白细胞介素2

D.他克莫司

E.抗淋巴细胞球蛋白