患者女，70岁，因口角糜烂2年就诊，检查发现两侧口角皲裂脱屑，上覆少量白色假膜，口内

预防接种属于（）

A.非特异性免疫

B.自然主动免疫

C.自然被动免疫

D.人工主动免疫

E.人工被动免疫

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

B

Every man wants his son to be somewhat of a clone, not in features but in footsteps. As he grows you also age, and your ambitions become more unachievable. You begin to realize that your boy, in your footsteps, could probably accomplish what you hoped for. But footsteps can be muddied and they can go off in different directions.

My son Jody has hated school since day one in kindergarten. Science projects waited until the last moment. Book reports weren’t written until the final threat.

I’ve been a newspaperman all my adult life. My daughter is a university graduate working toward her master’s degree in English. But Jody? When he entered the tenth grade he became a “vo-tech” student(技校学生). They’re called “motorheads” by the rest of the student body.

When a secretary in my office first called him “motorhead”, I was shocked. “Hey, he’s a good kid,” I wanted to say. “And smart, really.”

I learned later that motorheads are, indeed, different. They usually have dirty hands and wear dirty work clothes. And they don’t often make school honor rolls(光荣榜).

But being the parent of a motorhead is itself an experience in education. We who labor in clean shirts in offices don’t have the abilities that motorheads have. I began to learn this when I had my car crashed. The cost to repair it was estimated at $800. “Hey, I can fix it,” said Jody. I doubted it , but let him go ahead, for I had nothing to lose.

My son ,with other motorheads, fixed the car. They got parts(零件）from a junkyard, non-toasting toaster have been fixed. Neighbours and co-workers trust their car repair to him.

Since that first repair job, a broken air-conditioner, a non-functioning washer and a non-toasting toaster have been fixed. Neighbors and co-workers trust their car repairs to him.

These kids are happiest when doing repairs. They joke and laugh and are living in their own relaxed world. And their minds are bright despite their dirty hands and clothes.

I have learned a lot from my motorhead: publishers need printers, engineers need mechanics, and architects need builders. Most important, I have learned that fathers don’t need clones in footsteps or anywhere else.

My son may never make the school honor roll. But he made mine.

In the author’s eyes, motorheads are（）.

A. tidy and hardworking

B. cheerful and smart

C. lazy but bright

D. relaxed but rude

生产矿井各个安全出口的距离不得小于（）m。

A、20

B、30

C、10

分配论

1993年以来，我国内蒙古地区经常出现沙尘暴，造成重大经济损失。有人认为，沙尘暴是由于气候干旱造成草原退化、沙化而引起的，是天灾，因此是不可避免的。
以下各项如果为真，能够对上述观点提出质疑，除了（）。

A．上世纪50年代，内蒙古锡林郭勒草原的草有马肚子那样高，现在的草连老鼠都盖不住。

B．在内蒙古呼伦贝尔和锡林郭勒退化草原的对面，蒙古国草原的草高达1米左右。

C．在几乎无人居住的中蒙10公里宽的边界线上，草依然保持上世纪50年代的高度。

D．沙尘暴增多主要是由于超载放牧、对草原掠夺性经营等人为因素造成。