Why does the tracking system set a 100-metre minimum before sending an alarm to the operations centre?

A．To leave time for the operations centre to give an alarm

B．To keep police informed of the car’s movements

C．To give the driver time to contact the operations centre

D．To allow for possible errors in the GPS system

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1 What will the operations centre do first after receiving an alarm?

A．Start the tracking system

B．Contact the car owner

C．Block the car engine

D．Locate the missing car

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2 Questionsare based on the following passage.
Psychiatrists （精神病专家） who work with older parents say that maturity can be an asset in child rearing-older parents are more thoughtful, use less physical discipline and spend more time with their children. But raising kids takes money and energy. Many older parents find themselves balancing their limited financial resources, declining energy and failing health against the growing demands of an active child. Dying and leaving young children is probably the older parents’ biggest, and often unspoken, fear. Having late-life children, says an economics professor, often means parents, particularly fathers, “end up retiring much later.” For many, retirement becomes an unobtainable dream.
Henry Metcalf, a 54-year-old journalist, knows it takes money to raise kids. But he’s also worried that his energy will give out first. Sure, he can still ride bikes with his athletic fifth grader, but he’s learned that young at heart doesn’t mean young. Lately he’s been taking afternoon naps （午睡） to keep up his energy. “My body is aging,” says Metcalf. “You can’t get away from that.”
Often, older parents hear the ticking of another kind of biological clock. Therapists who work with middle-aged and older parents say fears about aging are nothing to laugh at. “They worry they’ll be mistaken for grandparents, or that they’ll need help getting up out of those little chairs in nursery school,” says Joann Galst, a New York psychologist. But at the core of those little fears there is often a much bigger one: “that they won’t be alive long enough to support and protect their child,” she says.
Many late-life parents, though,&nb

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3 What does the author mean by saying “For many, retirement becomes an unobtainable dream” （Lines 7-8, Para. 1）?

A．They are reluctant to retire when they reach their retirement age

B．They can’t obtain the retirement benefits they have dreamed of

C．They can’t get full pension unless they work some extra years

D．They have to go on working beyond their retirement age

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