二、阅读理解
A 跨学科·科学
体裁：应用文 主题：科学实验 难度：★★★★ 建议用时：6 min 正确率：/4
An Experiment about How to Get Clean Water
What you need:
A large cooking pot, a drinking glass with a heavy base, plastic food wrap, tape, muddy water, and a coin.
What to do:
Step 1: Pour about 5 cm of muddy water into the cooking pot.
Step 2: Place the drinking glass right side up in the middle of the cooking pot.
Step 3: Cover the cooking pot with clear plastic food wrap, stick the wrap with tape, but leave enough slack(松弛) in the wrap so that it can hang downwards.
Step 4: Place the coin in the middle of the pla图d food wrap so that the wrap hangs down in the middle, directly over (but not touching) the glass.
Step 5: Place the apparatus(装置) in direct sunlight.
What to see:
After ten minutes or so, little drops of water begin to appear on the underside of the plastic food wrap. They go down the plastic wrap slowly and fall into the glass. The water in the glass is now clean and the mud is left at the bottom of the cooking pot.
How it works:
This activity uses the energy in the sunlight to turn muddy water into drinking water.
Now you can drink clear, clean water if you are thirsty.
1. What do you need in Step 2 of the experiment?
①a coin ②a drinking glass ③plastic food wrap ④a large cooking pot
A. ①② B. ①③ C. ②④ D. ③④
2. 新趋势·图示理解 Which picture matches Step 4 in the experiment?
＞＞ 图示理解题解题策略略见 P58 重点精讲
A. B. C. D.
3. Where is the clean water collected in the end?
A. On the coin. B. In the drinking glass.
C. At the bottom of the cooking pot. D. On the surface of the plastic food wrap.
4. Where can you most possibly use the apparatus?
A. In a desert with no water. B. In the classroom at school.
C. In the kitchen of a restaurant. D. In the wild with no clean water.

【语篇解读】本文是一篇应用文。文章主要介绍了利用太阳能将泥水净化为干净饮用水的实验，包括所需材料、操作步骤、实验现象和原理。
1. C 细节理解题。根据“Step 2: Place the drinking glass right side up in the middle of the cooking pot.”可知第二步要用到大锅和水杯。故选C。
2. A 图示理解题。根据“Step 4: Place the coin in the middle of the plastic food wrap so that the wrap hangs down in the middle, directly over (but not touching) the glass.”可知第四步把硬币放在保鲜膜中间，使保鲜膜中间下垂。故选A。
3. B 细节理解题。根据“They go down the plastic wrap slowly and fall into the glass. The water in the glass is now clean”可知净化后的干净水收集在水杯里。故选B。
4. D 推理判断题。根据“This activity uses the energy in the sunlight to turn muddy water into drinking water.”可知该实验利用太阳能将泥水变成饮用水，由此推断这个装置可以在没有干净饮用水的野外使用。故选D。