Questions 19 to 21 are based on the conversation you have just heard.

单项选择题A．They found ways to speed up the reproduction of bald eagles.B．They developed new types of feed for baby bald eagles.C．They explored new ways to hatch baby bald eagles.D．They brought in bald eagles from Canada.

单项选择题A．Stop thinking about the matter.B．Talk the drug user out of the habit.C．Be more friendly to his schoolmate.D．Keep his distance from drug addicts.

单项选择题A．The epidemic has been brought under control.B．There are signs of progress in the peace process.C．Great improvements are being made in its capital.D．There’s little hope of bringing the conflict to an end.

单项选择题A．What chemicals tears are composed of.B．Whether crying really helps us feel better.C．Why some people tend to cry more often than others.D．How tears help people cope with emotional problems.

单项选择题A．Fifty underground stations were made waterproof.B．A flood wall was built.C．An alarm system was set up.D．Rescue teams were formed.

单项选择题A．Why people hold back their tears.B．Why people cry.C．How to restrain one’s tears.D．How tears are produced.

单项选择题A．A hardworking and ambitious young man.B．A young man good at managing his time.C．A college graduate with practical working experience.D．A young man with his own idea of what is important.

单项选择题A．It limited their supply of food.B．It made their eggshells too fragile.C．It destroyed many of their nests.D．It killed many baby bald eagles.

单项选择题A．One of the bridges between North and South London collapsed.B．The heart of London was flooded.C．An emergency exercise was conducted.D．A hundred people in the suburbs were drowned.

单项选择题A．She will do her best if the job is worth doing.B．She prefers a life of continued exploration.C．She will stick to the job if the pay is good.D．She doesn’t think much of job-hopping.