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.