有关纯碱和小苏打的叙述正确的是 A．等质量的Na2CO3、NaHCO3分别与足量

在如图所示的v－t图中，曲线A、B分别表示A、B两质点的运动情况，则下述正确的是（   ）

A．t＝1 s时，B质点运动方向发生改变

B．t＝2 s时，A、B两质点间距离可能等于2 m

C．A、B两质点同时从静止出发，朝相反的方向运动

D．在t＝4 s时，A、B两质点相遇

化学溶剂法是天然气脱硫的主要方法。

                                                        How to be Prepared

    Electricity, water, gas and telephone may not be working after an earthquake. The police and fire

department are likely to be tied up. You should be prepared to take care of yourself for at least three

days, preferably for a week.

     This list can also be applied to other disasters, such as floods or wildfires.

1.food and water (a gallon a day per person )

2.a first aid kit

3.a fire extinguisher suitable for all types of fires

4.flashlights, a portable radio extra batteries

5.blankets, clothes, shoes and money (ATMs may not work)

6.baby and pet food

     It's also a good idea to decide beforehand how where your family will reunite if separated during

a quake and to conduct in-home practice drills. You might choose an out-of-the-area friend or relative

that family members can call to check on you.

                                                   During an earthquake

     If you are indoors, stay there. Get under and hold onto a desk or table, or stand against an interior

wall. Stay away from exterior walls, glass, heavy furniture, and stay away from windows and outside

walls and do not use the elevator.

     If you are outside, get into the open, stay into the open, stay away from buildings, power lines or

anything else that could fall on you.

     If you are driving, move the car out of traffic and stop, avoid parking under or on bridges or

overpasses. Try to get clear of trees, light posts, signs and power lines.

If you are in a crowded public place, avoid panicking and do not rush for the exit. Stay low and cover

your head and neck with your hands and arms

                                                         After an earthquake

     If the phone is working, only use it in case of emergency. Likewise, avoid driving if possible to keep

the streets clear for emergency vehicles.

Be aware that items may fall out of cupboards or closets when the door is opened, and also that

chimneys can be weakened and fall with touch. Check for cracks and damage to the roof and foundation

of your home.

     Listen to the radio for important information and instructions. Remember that aftershocks, sometimes

large enough to cause damage in their own right,generally follow large quakes.

     If you leave home,leave a message telling friends and family your location.  

1.Which of the following items is unnecessary to prepare before an earthquake?

A. batteries  

B. Cash   

C. Medicine    

D. Credit card

2.When an earthquake comes,you should ______.

A. hide yourself in the kitchen        

B. rush for the exit immediately

C. stay away from heavy objects        

D. call the police right away

3.When an earthquake is over,you should______.

A. drive a car to take your family to the safe place

B. check the security of your home

C. call your relatives to tell them you are safe

D. clear up the mess as soon as possible.

4. Which of the following sentences is true according to the passage?

A. You'd better make it clear how and where your family will reunite if separated during a

     quake after the quake happens.

B. If you are indoors, get into the open.

C. If you are in a crowded public place, avoid panicking and do rush for the exit.

D. If the phone still works, only use it when necessary.

5. What does the underlined word "aftershock " mean?

A. A less serious quake following a large earthquake in the same area.

B. A further reaction following the shock of a deeply disturbing thing.

C. A mess one has to deal with after a terrible thing.

D. An instruction the government gives to solve problems.

图一为下丘脑对人体生理活动调节的过程，图二为兴奋在神经元之间传递的过程。请据图回答问题（甲、乙、丙、丁为人体内某种结构或细胞，A、B、C、D为激素）。

下丘脑除参与图中的调节过程外，还能分泌（）（填激素名称）由甲释放到血液中，调节人体内水盐的平衡。

国家规定并由工商行政部门公布必须使用注册商标的商品有（）。

A.烟草制品

B.儿童食品

C.地方特色产品

D.电子产品