They weather was cool yesterday, ________ ________?（完成反意疑问句）

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Thank you for joining CCTV’s around the World show. Today we are in Egypt(埃及). It’s beautiful sunny day! There are many people here on  .Some are taking photos. Others are riding camels （ 骆驼 ）.The Egyptians (埃及人)are wearing a kind of scarf on their heads. They look cool! They wear them because it is so hot . This is a very interesting place . I’m looking at the five thousand years of history .
【小题1】Where are they ?
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【小题2】How is the weather in Egypt ?
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【小题3】What are the people on vacation doing ?
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【小题4】Why do the Egyptians look so cool ?
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【小题5】How many years is the history of Egypt ?
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Do you know something about tree rings (年轮)? Do you know they can tell us what the weather was l__1___, sometimes even hundreds of years ago?

A tree will grow well in a climate with lots of sunshine and rainfall. And l__2__ sunshine or rainfall will limit (限制) the growth of a tree. We can see the change of climate by studying the tree rings. For e___3___, to find out the weather of ten years ago, count the rings of a tree from o___4___ to the inside. If the t___5___ ring is far from the eleventh ring, then we are sure that it was sunny and rainy most of that year. If it is near to the eleventh ring, then the climate that year was bad.

Tree rings are i___6___ not only for studying the history of weather but also for studying the history of man. Long long ago there lived a lot of people at a place in New Mexico. But now you can find only s___7___ there—no trees and no people. What h____8___?

A scientist studied the rings of d___9__ trees there. He found that the people had to leave b__10___ they had cut down all trees to make fires and buildings. As all trees had gone, the people there had to move. 

What would happen if you tried to blow a soap bubble in freezing weather? Would it freeze solid(固体) and fall to the ground? Would you have to hit it to break it? These questions happened to me on a cold winter day. It was too cold to play in the snow, but it was a perfect time to experiment with blowing frozen bubbles.

To blow frozen bubbles, I used dishwashing soap and a drop of glycerin（甘油） to make it even better. I chose a place out of the wind, and blew bubbles the same way I always do. I watched to see what would happen. Here’s what I learned.

If the temperature is low enough, the skin of the bubbles frosts over (结霜), becoming cloudy instead of clear. And what about those rainbow swirls（旋转） you see in soap bubbles? The rainbow colors stay even when the bubbles frost, but they don’t swirl anymore. The bubbles still stay in the air. They don’t fall to the ground any faster than they would on a warm summer day.

When these frozen bubbles break, they don’t turn into small water drops as summer bubbles do. They turn into flashing rainbow confetti（碎屑） and move slowly to the ground. Sometimes a frozen bubble will roll across the snow without breaking. If nothing disturbs the bubble, it may stay there for a long time. Sometimes I could catch a bubble and hold it until the heat of my hand made it pop.

I learned another thing about blowing frozen bubbles. It’s so interesting that I want to try it again next year.

1.It is the perfect time to blow frozen bubbles on a ___________day.

A．cold winter        B．warm spring        C．hot summer        D．sunny autumn

2.When the frozen bubbles break, _________.

A．they make a big sound                   B．they turn into small drops

C．they fall to the ground like rain             D．they become rainbow confetti

3.The purpose of the passage is _______.

A．to learn how to do a science experiment

B．to show the experiment of blowing frozen bubbles

C．to discover games that are fun to play in the snow

D．to invent a new kind of soap that makes stronger bubbles