京剧是我国的“国粹”。随着电影《梅兰芳》的上映，观众中掀起了一股“京剧热”，这启示我

The earth moves round the sun, and the moon moves round the earth. When our part of the earth turns to the moon, it is night.

The sun is much bigger than the moon. But sometimes the moon looks bigger than the sun, because it’s much nearer to the earth.

The sun is very bright. It gives a very strong light. The moon looks quite bright,  too. But it doesn’t give any light at all.

The moon looks much bigger and brighter than the stars. But actually the stars are much bigger and brighter than the moon. They look smaller than the moon because they’re much farther away from us.

Read and choose the right answer

小题1:____moves round________.

A．The earth; the moon

B．The moon; the earth

C．The moon; the stars

D．The sun; the earth小题2:Sometimes the moon looks bigger than the sun, because_________.

A．it is much bigger than the sun

B．it comes out only at night

C．it is much nearer to the earth than the sun

D．it doesn’t give a strong light小题3:The sun_______________.

A．is very bright, and it gives a very strong light

B．isn’t bright, but it gives a very strong light

C．is very big, but it doesn’t give any light at all

D．is very round, but it can’t move round小题4:The stars______________.

A．look much bigger than the moon

B．look much bigger than the sun

C．are a lot brighter than the moon, but they are not bigger than the moon

D．are much farther away from us than the moon

社会发展的历史首先是阶级斗争的历史。 ( )

计数器不浸在被测水中的水表称为（）。

A、指针式水表

B、液封式水表

C、湿式水表

D、干式水表

光化学烟雾是一种混合物的总称。它是排入大气中的NOx、碳氢化合物受太阳紫外线作用，发生光化学反应所产生的一种具有刺激性很强的（）的混合烟雾。

A.浅蓝色

B.无色

C.浅褐色

增加易于氧化的药物稳定性的方法有哪些？