How does an
earthquake start2 What makes an earthquake happen? The rock of
the earth's crust (地壳) may have a fault, a kind of break in the
surface. The blocks which make up the earth move, and sometimes
this may cause the sides of the fault to move up and down or lengthways (纵向地)
against each other. When one piece of rock starts to rub on another with great
force, a lot of energy is used. This energy is changed into vibrations (震动) and
it is these vibrations that we reef as an earthquake. The vibrations can travel
thousands of kilometers and so an earthquake in Turkey may be felt in
Greece. What to do during an earthquake? At
school As soon as the earthquake starts, students should get
under the desks immediately and wait until the teacher tells them it is safe to
come out. The teacher should, at the same time, go immediately to the teacher's
desk, get underneath (在……下面) it and stay there till the danger is over. Students
must not argue with the teacher or question instructions. As
soon as the tremors (震动) stop, all students should walk towards the exit and go
straight to the school playground or any open space such as a square or a park.
They must wait there until the teacher tells them it is safe to go.
At home If you are at home when the earthquake occurs,
get immediately under the table in the living room or kitchen. Choose the
biggest and strongest table you can find. You must not go anywhere near the
window and don't go out onto the balcony (阳台). Once the tremors have stopped,
you can come out from under the table but you must leave the building straight
away. You should walk down the stairs and should not use the lift-there may be a
power cut as a result of the earthquake and you could find yourself trapped
inside the lift for hours. In the street If
you are in the street when the earthquake takes place, do not stand near
buildings, fences or walls—move away as quickly as possible arid try to find a
large open space to wait in. Standing under trees could also be
dangerous.
单选题
People knew long ago how an earthquake starts.