控制惊厥首选下列哪种药物A．地西泮B．10%水合氯醛C．丙戊酸钠D．苯巴比妥钠E．苯妥英钠

A．In caves.

B．Inside archaean.

C．On the ocean floor.

D．Far below the Earth's crust.

A．Iron.

B．The Earth's crust.

C．The minerals from the Mars.

D．Some unknown planet.

Man's research on earthquake forecast at present is to ______.

A．reduce the loss from earthquake disasters

B．lower the frequency of earthquakes

C．release the energy that causes earthquakes

D．analyze the relationship between different earthquakes

A．Hot rock.

B．The Earth"s mantle.

C．Oceanic crust.

D．Mid-ocean ridges.

The destruction of Agadir is an example of ______.

A．faulty building construction

B．an earthquake's strength

C．widespread panic in earthquakes

D．ineffective instructions

A．Hot rock.

B．The Earth's mantle.

C．Oceanic crust.

D．Mid-ocean ridges.

the earth' s surface meet or by ______.

What did P and S waves help scientists discover about the layers of the earth？

A．How deep they are.

B．Where earthquakes form.

C．How hot they are.

D．What purpose they serve.

e them, and tides are caused by the effect of the gravity of the moon on the earth and also, although to a lesser extent, the sun's gravity. One bulge of water is drawn upon the side of the earth actually facing the moon; another bulge of water is drawn on the earth's far side.

What are tides caused by？

A．The sun's gravity alone.

B．The moon's gravity alone.

C．The moon and the sun's gravity.

D．The earth.

ust.

A．repelled

B．released

C．run

D．rushed