下列关于人体细胞增殖、分化、衰老、凋亡和癌变的叙述,正确的是( ) A . 癌细胞具有细胞增殖失控的特点 B . 细胞的分化程度越高,全能性越易实现 C . 衰老细胞的体积和细胞核体积均变小 D . 无丝分裂过程中没有出现DNA复制和染色体的变化 答案:A55% of deaths caused by road accidents occur in the
first few minutes after a crash. Up to 85% of these deaths could be prevented
if first aid were given. The first person on the scene of a road accident will
almost certainly be another road user. So as a driver your knowledge of first
aid could make a real difference to someone in the event of a road accident.
Assess conditions
·Remain calm.
Judge the scene and seriousness of the collision.
·Determine
what has happened, how many people and vehicles are involved and the exact
location.
·Determine how
many casualties(伤亡人数) there are, what is the severity of the
injuries, whether anyone is trapped, and whether there is a danger of fire.
Make safe
·Make sure you
stay safe and keep off the road. If you need to stop or warn approaching cars,
signal to them from the pavement. Wear reflective clothing, use warning
triangles, flashing lights and warning lights. Don’t smoke.
·If you are in
a car and you come across an accident, first park safely and turn off the
engine before you get out to help. Use a triangle warning danger if necessary.
·Consider the
safety of others. Don’t move the vehicles, look out for dangers — leaking fuel,
chemicals, broken glass or dropping loads — guide uninjured passengers to a
place of safety.
Call for help
Dial 999 (or 112) for the emergency services. If there
is no phone nearby, send two people in opposite directions to seek help.
Do this as soon as you can or get someone else to do
it while you deal with an injured person. You will need to tell the emergency
services:
·where you are
·what has
happened (describe the accident)
·how many
people are injured
·whether they
are breathing or bleeding.
The operator will talk you through what to do while
you wait for an ambulance to arrive.
Apply emergency
first aid
·Remain calm.
Reassure the victims.
·Do not allow
smoking or offer food or drink to casualties as this could hamper urgent
medical treatment.
1.The
passage mainly tells us ______.
A. how to reduce road accident deaths
B. how to perform first aid in a road accident
C. how to treat the injured people on the scene
D. how to protect us from being injured in an accident
2.When
a driver is applying first aid, which of the following is proper?
A. Stand in the middle of the road to stop or warn
approaching cars.
B. Leave the engine working when he gets out of his
car to help.
C. Call 999 for an ambulance to come and leave the
scene immediately.
D. Make sure the scene is safe enough and stay away
from dangerous gas leaking.
3.What
does the underlined word “hamper” mean in the last paragraph?
A. Affect. B.
Improve. C.
Demand. D.
Judge.
4.The
passage is most likely to appear in a newspaper’s ______ section.
A. business and finance B.
sports and entertainment
C. travel and traffic D.
customs and cultures