8. B。根据最后一段中的第一句可知B项正确

7.D。第五段直接说出低盐的食物可以预防高血压；结合以上几段可知低盐食物可以让孩子少喝含糖的饮料，而含糖的饮料会导致发胖，因此D项正确。

6. A。通过第四段可知，A项所述为新的研究发现。

5. B。从第二段中“It has been shown that sugar-sweetened soft drink consumption is related to obesity in young people.”和第四段最后一句可知，喝含糖饮料会导致热量摄入而引发肥胖，因此B项正确。

4. A 事实细节题。要求排列事件顺序。可用首尾定位法。第一个事件是 entered the Moscow University Medical School，最后一个事件是 became a full time writer，故答案为 A。

3. D 事实细节题。文中讲到了他的品质有：cool, sensitive (calm attitude of a scientist and doctor with the sensitivity of an artist) , quick-minded (extremely fast, often producing a short story in an hour or less)，但没有涉及到warm-hearted这方面的品质。

2. B 推理判断题。根据 When Chekhov entered the Moscow University Medical School in 1879 可知契诃夫 1879 年进入莫斯科大学学医，可以断定契诃夫 1880 年正在大学学医。

1. D 事实细节题。根据 A qualified doctor who rarely practiced 可知，契诃夫是个合格的医生。

8. After reading the passage, who should take effective action?

A. Children.　

B. Parents.　

C. Doctors.　

D. Researchers.

[答案与解析]

7. Which of the following statements would Dr He agree to?

A. The less salt people eat, the healthier people become.

B. Children should reduce fluid intake in their daily life.

C. No high-salt food products will be available in shops.

D. A low-salt diet may prevent both high blood pressure and obesity.