什么是人口老龄化？

以下说法哪项是不正确的（）

A.轻度智力低下多能找到病因

B.一般来说，智力低下的IQ在70以下

C.手足徐动型脑瘫主要损伤部位是小脑

D.脑瘫以强直型较为多见

E.进行性肌营养不良的肌肉萎缩多以远端为主

常用的卫生技术评价方法中，经济评估的主要类型有（）

A.成本最小化分析

B.成本效果分析

C.成本效用分析

D.成本效益分析

E.以上全对

下列哪项符合急性粒细胞白血病原始粒细胞与急性淋巴细胞白血病原始淋巴细胞扫描电镜细胞表面超微结构的差异（）

A.急性粒细胞白血病中较大原粒细胞以嵴样及球样突起型为主，急性淋巴细胞白血病中T淋巴细胞以光滑型为主，其中B细胞型可出现长而多的微绒毛

B.急性粒细胞白血病中较大原粒细胞以光滑型为主，急性淋巴细胞白血病以嵴样及球样突起型为主

C.急性粒细胞白血病中较大原粒细胞以皱膜型为主，急性淋巴细胞白血病以嵴样及球样突起型为主

D.急性粒细胞白血病中较大原粒细胞以嵴样及球样突起型为主，急性淋巴细胞白血病以皱膜型为主

E.急性粒细胞白血病中较大原粒细胞以嵴样及球样突起型为主，急性淋巴细胞白血病以光滑型为主，其中B细胞型可出现短而多的微绒毛

The clock struck eleven at night. The whole house was quiet. Everyone was in bed except me. Under the strong light, I looked sadly before a huge pile of troublesome things they call “books”.

I was going to have my examination the next day. “When can I go to bed?” I asked myself. I didn’t answer, in fact I dared not.

The clock struck 12. “Oh, dear!” I cried, “ten more books to read before I can go to bed!” We pupils are the most wretched(可怜的) creatures in the world. Dad does not agree with me on this. He did not have to work so hard when he was a boy.

The clock struck one. I was quite hopeless now. I forgot all I had learnt. I was too tired to go on. I did the only thing I could. I prayed, “Oh, God, Please help me pass the exam tomorrow. I do promise to work hard afterwards, Amen.” My eyes were heavy, so heavy that I could hardly open them. A few minutes later, with my head on the desk, I fell asleep.

小题1:When the author was going over his lessons, all the others in the house were_____ .

A．asleep

B．working

C．outside

D．watching TV小题2:Reviewing his lessons didn’t help him at all because ____________.

A．he thought it was useless doing this at night

B．his parents were not able to help him

C．his eyes were so heavy that he couldn’t keep them open

D．he hadn’t studied hard before the examination小题3: What do you suppose happened to the author later？

A．He went to a church to pray again

B．He passed the exam by luck

C．He failed in the exam

D．He was punished by his teacher

进料量状态变化对精馏操作的影响描述不正确是（）。

A、进料为气相时，塔顶产品重组分浓度增加

B、进料为冷凝或饱和液体时，塔釜中轻组分含量增加

C、只要进料状态发生变化，对塔顶、塔釜将有很大影响

D、进料为汽液混合时，会增加精馏段的气体负荷和提馏段段的液体负荷