At a safe distance, they listened to the explosions and watched smoke ________ into the sky.

[单选题]The sun is one of thousands of( )in the sky.A.planetsB.moonC.starsD.orbits

[单选题]__________ can fly very high in __________ sky.A.The birds ... theB.The bir

On a clear night you can see myriad stars ______ in the sky.A. twinklingB. glist

[名词解释] 安全保护距离safe protection distance

[问答题]The moon looks much bigger than any other stars in the sky.

Rainbows___________when sunlight passes through small drops of water in the sky.

[单选题]During volcanic _____, dark clouds of smoke fill the sky, bringing fears to

三.填空题 -|||-2.-|||-I stood __ the driveway and watched my grown children drive in

Do you want to know something about the history of weather？ Dont look at the sky

[单选题]C．rankcase explosions in propulsion diesel engines result fromA．the splashing of lubrication oil by the crankshaftB．the dilution of crankcase oil with particles of combustionC．broken fuel lines spraying oil on the crankcaseD．the ignition of unburned