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(3)所有从0点射入的粒子均会平行于y轴射出磁场，沿x轴y正方向射出的粒子A经过y轴时离O点最远，设最远距离为y1,与x轴正方向成30角的粒子B经过y轴时离0点最近，设最近距离为y2E粒子A离开磁场时离y轴的距离为R,则有PR=at2,y1-R=vt(2分)60°××××粒子B离开磁场时离y轴的距离为R一Rcos60,则有00’丙R-Rcos60°=at2,ya-R=vt(2分)

The truth 1. trees are vital to our life is not a secret. They provide us with food, wood and most 2. (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.

The discovery 3. (make) by a team 4. (consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students 5. were seeking a natural water filter—one that would help communities in developing countries that do not have 6. (accessible) to modern water filter systems.

The 7. (research), led by Professor Rohit Karnik, decided to turn to trees for help because they could allow liquid to flow through, while blocking out air bubbles.

They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood’s filtering ability by pouring water containing red dye particles of different sizes through. 8. their amazement, they found that it was effective in trapping all the articles. 9. (encourage), the team conducted 10. experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.

试题答案

1.that

2.importantly

3.was made

4.consisting

5.who

6.access

7.researchers

8.To

9.Encouraged

10.another

【解析】

1.

2.

3. made。

4. of “由…组成”没有被动，现在分词作定语consisting。

5.

6. access to。

7.

8.to one’s +名词 , 位于句首首字母大写，填To 。

9.

10.

考点：词汇的运用

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