马尾松毛虫主要为害马尾松等松类树，是我国南方重要的森林害虫。

我国北方一个自然保护区有黑天鹅27只，有东北虎243只，东北虎的只数是黑天鹅的几倍？

用其他塑料浸渍的其他纺织物

阅读理解。

     In bringing up children, every parent watches eagerly the child's acquisition (学会) of each new skill-the

first spoken words, the first independent steps, or the beginning of reading and writing. It is often tempting

to hurry the child beyond his natural learning rate, but this can set up dangerous feelings of failure and states

of worry in the child. This might happen at any stage. A baby might be forced to use a toilet too early, a young

child might be encouraged to learn to read before he knows the meaning of the words he reads. On the other

hand, though, if a child is left alone too much, or without any learning opportunities, he loses his natural

enthusiasm for life and his desire to find out new things for himself.

     Parents vary greatly in their degree of strictness towards their children. Some may be especially strict in

money matters, others are sever over times of coming home at night or punctuality for meals. In general, the

controls imposed represent the needs of the parents and the values of the community as much as the child's

own happiness.

     As regards the development of moral standards in the growing child, consistency is very important in

parental teaching. To forbid a thing one day and excuse it the next is no foundation for morality (道德). Also,

parents should realize that "example is better than precept". If they are not sincere and do not practice what

they preach (说教), their children may grow confused and emotionally insecure when they grow old enough

to think for themselves, and realize they have been to some extent fooled. A sudden awareness of a marked

difference between their parents' principles and their morals can be a dangerous disappointment.

1. Eagerly watching the child's acquisition of new skills _____.

A. should be avoided

B. is universal among parents

C. sets up dangerous states of worry in the child

D. will make him lose interest in learning new things

2. When children are learning new skills, parents should _____.

A. achieve a balance between pushing them too hard and leaving them on their own

B. not expect too much of them

C. encourage them to read before they know the meaning of the words they read

D. create as many learning opportunities as possible

3. The second paragraph mainly tells us that _____.

A. parental restrictions vary, and are not always for the benefit of the children alone

B. parental controls reflect only the needs of the parents and the values of the community

C. parents should be strict with their children

D. it's parents'and society's duty to control the children

4. The word "precept" in Paragraph 3 probably means "_____".

A. idea

B. punishment

C. instruction

D. behaviour

5. In moral matters, parents should _____.

A. satisfy their children's needs

B. be aware of the marked difference between adults and children

C. forbid things which have no foundation in morality

D. observe (遵守,奉行) the rules themselves

对于类风湿关节炎下列哪种药不属于促进缓解药物（）

A.金诺芬

B.环磷酸酰胺

C.青霉胺

D.保泰松

E.磷酸氯喹

某种淋巴细胞能够分泌一种称为穿孔素的蛋白质。穿孔素可将被病毒感染的细胞或肿瘤细胞的膜溶解而形成孔洞，导致该细胞解体死亡。下列有关说法不正确的是（）

A.效应T细胞能识别靶细胞与细胞膜上的糖蛋白有关

B.指导穿孔素合成的基因在浆细胞中也存在

C.穿孔素是淋巴细胞分泌的一种抗体

D.淋巴细胞分泌穿孔素的过程要依赖膜的流动性