10. We shouldn't be merciful to those who break the law.

我们不应该对违反法律的人仁慈。

Ⅲ. 单句改错

1. It is the superior intelligence and the use of language that distinguish man between the other animals.

(between改为from)

2. Suddenly a stranger seized him by his arm.

(his改为the)

3. The kind lady usually is mercifully to those homeless people.

(mercifully改为merciful)

4. Will it be convenient of you to come in the morning?

(of改为for)

5. You can arrange the matter for your own convenience.

(for改为at)

6. I was advised to be cautious with my fat in my diet.

(with改为about)

7. I was doing an experiment when Li Hua called me off.

(off改为up)

8. As soon as he drank up his coffee, he set about to working again.

(去掉to)

9. When she arrived at her destination, the first thing which she did was find a hotel to settle down.

(which改为that或去掉which)

10. When seeing on the top of the mountain, the city looks much more beautiful.

(seeing改为seen)

Ⅳ. 阅读理解

Cancer is a terrible disease. Every year in the UK, more than 330, 000 people get cancer, and doctors usually use a kind of therapy called radiotherapy to treat people. This treatment uses high energy X-rays to destroy the disease, but the effects of treatment can be nearly as bad as the cancer. As the X-rays destroy the cancer cells, they also damage healthy cells that are next to them. It's like using a shotgun to kill an insect. When really important parts of a person's body are hurt by the X-ray energy, it can have very bad results. It can also make more cancers grow in the damaged places in the future.

A new therapy that uses protons(质子) instead of X-ray energy could be the answer to the problem. In a project called PRaVDA, scientists from the UK and South Africa are working to this. If X-ray energy is like a shotgun, then protons can work more like a laser. Scientists can make protons travel through someone's body without hurting them, and only damage the cancer.

The PRaVDA scientists use computers to make a 3-D model of the cancer cells to make sure the protons go to the right places. "It's more accurate, " said Michaela Esposito, PhD, from the University of Lincoln.

Building this technology was very difficult, though. Professor Nigel Allinson from the