Many earthquakes happen without warning, so it is important to know what to do when it happens. Here are some tips on how to stay safe in earthquakes.
◆Keep a cool head. Worry won’t help you. Think about what you should do. The first several seconds are important.
◆If you are indoors, stay inside and duck and cover. Hide under a desk or table, or stand in a corner. Cover your head and neck with your arms. Stay away from windows and anything that could fall on you.
◆If you are in a crowded(拥挤的) hall or shop, don’t rush for the door. You will find too many people trying to get out at the same time. Instead, lower(降低) yourself close to the ground and cover your head and neck with your hands and arms.
◆If you are outdoors, try to get into an open area away from buildings, trees or street lights.
◆If you are trapped in a place, you may make noises by knocking at the rocks. But don’t shout all the time. You could be without help for up to 72 hours. Try to find some water and food.
◆Stay in your seat if in a cinema or a theatre. Get below the level(水平线) of the back of the seat. Cover your head and neck with your arms.
◆Stay in a safe area until you are sure it’s OK to leave. Some aftershocks(余震) may follow. They are as dangerous as the earthquake.
小题1:The best title(题目) of the passage is ____________.
A．Advice for dangerous situations
B．How to keep calm in earthquakes
C．Ways to protect yourself in earthquakes
D．Be careful with aftershocks小题2:The underlined word “duck” in Tip 2 means _____________.
A．a water bird with short legs
B．some kind of meat for eating
C．walk like a duck
D．lower your head or body very quickly小题3:_________ should be the most important part(s) to be protected in earthquakes.
A．Your head and arms
B．Your head and neck
C．Your neck and arms
D．Your arms小题4:. From the passage we know that _________.
A．keeping calm is very important during the earthquake
B．we can hide under the tree during the earthquake
C．we don’t have to care about aftershocks
D．we should keep shouting for help if we are trapped
CO（g）+ H2（g）（正反应为吸热反应）在一可变容积的密闭容器中进行，在其它条件不变的情况下，下列条件的改变对其反应速率几乎无影响的是（ ）