女，38岁，有SLE史。因贫血、脾大入院。实验室检查：Coombs试验阳性，考虑溶血

下列关于细胞共性的描述正确的是[ ]

A．所有细胞内都含有糖原

B．细胞都能进行分裂和分化

C．细胞都具有细胞质和细胞膜

D．用龙胆紫溶液染色细胞，都能观察到深色的染色体

According to a new survey, student safety has become a big problem. Nearly 50% of students say they are worried about robbery(抢劫) on the way to and from school. Now in many big cities in China, some schools have taught an unusual lesson: self-protection(自我保护). Students like this lesson because there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens.

Chen Haoyu, a teacher at Beijing No.25 Middle School and a self-protection expert(专家), gives young students advice on how to deal with danger.

If you are robbed

Keep calm. If you can not cry for help or run away, give the robber your money. Try to 

remember what the robber looks like and tell the police later.

If you are in a traffic accident   

If a car hurts you, you should remember the car number; if it is a bicycle, try to call your

parents before you let the rider go. This is because you don’t know how badly you are hurt.

If it is raining hard and there is lightning(闪电)

Don’t stay in high places and keep away from trees.

When there is a fire

Get away as fast as you can. Put wet things on your body and try to find an exit (出口).

Do not take the lift!    

If someone is drowning (溺水)

If you can’t swim, don’t get into the water. Cry out for help. Remember that danger is never as far away as you think. Take care of yourself at all times!

小题1:Why do students like the self-protection lesson?

①Because there are no tests.

②Because the lesson is boring.

③Because they can learn how to save lives.

④Because they know how to stop danger before it happens.

A．①②

B．②③

C．①②④

D．①③④小题2:If your house is on fire, you must _______.

A．putdrythingsonyourbody

B．runquicklyandtakethelift

C．runawayandfindanexitasquicklyasyoucan

D．takeeverythingyouhaveandthenrunaway小题3:The best title for the passage is         .

A．How to Keep Calm

B．Self-protection

C．An Unusual Lesson

D．Danger

2009年4月，甲型H1N1流感首现于墨西哥，并迅速蔓延至全球很多国家，科学家经过深入研究，发现了一种细菌K在杀死甲型H1N1病毒的同时能够自身复制，已知1个细菌K可以杀死一个甲型H1N1病毒，（K杀死甲型H-1N1病毒时，自身会解体）并且生成2个细菌K，那么一个细菌K和1024个甲型H1N1病毒作用后最终一共有细菌K的个数是（　　）

A．1024

B．1025

C．2048

D．2049

某商品按定价的八折出售，售价14.8元，则原定价是______元．

在低压架空线路中，导体的排列一般多采用（）。

A、正三角形排列

B、水平排列

C、垂直排列