按照使用材料的不同，常用的通信管道可分为水泥管管道、钢管管道和（）管道。

下列哪位作家是戏剧团体“南国社”的创办人？（）

A.田汉

B.洪深

C.欧阳予倩

D.丁西林

两杂合子黄色豌豆杂交产生种子120粒，其中纯合子黄色种子的数目约为[ ]

A．0

B．30

C．60

D．90

在DPP中改变白平衡调节，调到“阴影”处，可以使日出与日落时拍摄的图像（）

A、偏亮

B、偏暗

C、偏暖

D、偏冷

专业店分类陈列的注意事项有哪些？

As the American writer, Mark Twain, once said, "Everybody talks about the weather, but nobody does anything about it." It is true that everybody talks about the weather; it’s the most common way of starting a conversation.
Many people think they can tell what the weather is going to be like. But they hardly ever agree with each other. One man may say, "Do you see how cloudy it is in the east It’s going to rain tomorrow." Another man will say, "Yes, it’s cloudy in the east. We’re going to have fine weather tomorrow."
People often look for the weather they want. When a farmer needs water, he looks for something to tell himself it’s going to rain; he won’t believe anything else. When friends have a picnic (野餐), they are so sure the weather is going to clear up very quickly when they sit eating their lunch in the rain.

People can usually tell about the weather correctly.
[A] Right [B] Wrong [C] Doesn’t say

Almost everyone listens to what the weatherman says. But he doesn’t always tell us what we want, and once in a while he makes a mistake. Still, he probably comes closer to being correct than anyone else.