阅读理解

      Look up in the sky. Do you see any clouds? What do they look like ?Some clouds are fluffy（绒毛状的）and white, like cotton balls. Others are dark, almost black, and make you hold an umbrella. At sunrise and sunset, clouds can look red, purple, or yellow，as if they were colored with crayons. But what are clouds anyway?

   You can't reach out and touch the clouds, but you can make your own in a bottle.

   You need :

   An adult helper

   A huge, empty glass container（容器）

   A metal strainer（滤网）

   Hot water

   Ice

   Do these:

   Step1. Have your helper fill the container with hot water ,leave it there for two minutes, then pour out most of the water, leaving just an inch or two at the bottom of the container.

   Step2. It's your turn now. Put the strainer over the mouth of the container. Fill the strainer with ice. Watch the container.

What happened?

A cloud formed in the container! Some of the hot water at the bottom of the container turned into the hot water vapor. The water vapor rose and met with cold air coming off the ice. When the water vapor condensed（凝结）,it formed a cloud. Hot air rises ad carries with it lots of water vapor. The higher the air rises, the more it cools down. Soon the cold air can't hold all the water vapor so it starts turning into tiny water drops, and becomes a cloud.

苏通大桥施工时，要向江中沉放大量的施工构件，假设一正方体构件被缓缓吊入江水中（如图甲），在沉入过程中，其下表面到水面的距离h逐渐增大，随着h的增大，正方体构件所受浮力F₁、钢绳拉力F₂的变化如图乙所示．下列判断正确的是（  ）

作文：

       “邂逅”，主要指偶然的、不期而遇的，与“遇见”不同，“遇见”可以是认识的，也可以是不认识的，而“邂逅”只能是陌生的。邂逅一阵风，你感知到自由；邂逅一朵花，你领略到绮丽；邂逅一个暖心的人，你心生温情……邂逅是于千万人海之中，我一眼就找到了你，是最美丽的相遇。

       请以“美丽的邂逅”为题，写一篇文章。

       要求：①要有真情实感；②自定立意，自选文体（诗歌除外）；③不少于600字；④不得抄袭、套作；⑤不得出现真实的人名、校名和地名。