Questions 11 through 13 are based on the following passage.

11. A. A number of giant rats are hidden in the fields or forests.

B. Violent robbers may come out and hurt innocent civilians.

C. People may step onto a landmine(地雷) and get injured.

D. Other roads have a litter problem, which spoils good mood.

12. A. It is a rare species of rat.

B. It has a good sense of smell.

C. It sacrifices its life to detect dangers.

D. It is terrified of explosive device.

13.A. 13 minutes B. 30 minutes

C. 40 minutes D. 4 days

Questions 14 through 16 are based on the following passage.

14.A. It bans the sales of salty and unhealthy food.

B. Its residents lose altogether 100,000kg by 2020.

C. Everyone weighs himself on giant scales in public.

D. Local doctors make personalized diets for everyone

15. A. Local people share healthy diet with each other.