如图，用6牛的水平力将一个重为3牛的A木块压在墙壁上，用力的图示法画出A木块对墙

甲亢良性（非浸润性）突眼的眼征，主要是由于 （）

A.眼球肿大

B.眼球后组织有细胞浸润

C.眼球后组织水肿

D.眼睑张力增高

E.精神紧张

属于原始反射的是（）

A.降落伞反射

B.阳性支持反射

C.肱二头肌反射

D.倾斜反应

E.对光反射

《企业事业单位内部治安保卫条例》是从（）起实施的。

A、2005年12月1日

B、2004年10月1日

C、2004年12月1日

D、2005年10月1日

下列各项中，可以采用分类折旧方式计提折旧的是（）。

A.年限平均法

B.工作量法

C.双倍余额递减法

D.年数总和法

Optimism is the art of always seeing the glass half full (1) half empty, finding something positive in even the most (2) of situations and last but not least the ability to expect the best even if the chances are (3) . It enables you to try new things, deal with failure as a learning experience (4) a stopping point. In general optimism gives you a reason to live. The world would be a better place if it was full of optimism, (5) unfortunately the trend in today’s youth is (6) the opposite way. Today it is (7) to be pessimistic. One could spend hours discussing how we arrived at this point, (8) our youth refuses to smell the roses and instead prefers to (9) themselves on their own pessimistic (10) .

Optimism is not an (11) gift but rather a learned behavior (12) . Like most behaviors optimism is best learned by watching examples, (13) you. The first step in creating a generation of people with a positive outlook on life, is to (14) life on the bright side yourself. (15) it would be wrong to (16) your child from all negativity, it is important that you are not the (17) of doubts and worries. Finding something positive in a negative situation needs to be (18) Show how to make the best of things by always (19) the positive, by encouraging your child after a(n) (20) and by explaining over and over that failure is just a part of progress.

20（）

A.obstruction

B.impediment

C.disappointment

D.hindrance