单选题 If you're relying on Grandma to help with child care, it's time to reconsider. A new study of more than 54 000 women found that those who watched their grandkids 9 hours a week or more were 55% more likely to have a heart attack. These women may have less time to take care of their own health, says lead author Sunmin Lee, ScD, of the Harvard School of Public Health. Younger kids may pose more risk because they need more care.
"However willing your mom might seem, it's up to you to figure out how much she can really handle," says Meredith Minkler, DrPH, a public-health professor at the University of California, Berkeley, and an expert on grandparents as caregivers. "It's not just about physical health. Older adults need time to connect with people of their own age. Social isolation is a major risk factor for illness." If your mom helps out, make sure she has breaks during the day, as well as "vacations" at regular intervals.

单选题 The writer of the text suggests that ______.

A. grandparents take care of younger children
B. young people be careful about their parents
C. old women spend more time taking care of their own health
D. child care by grandmas be considered

【正确答案】 C

【答案解析】[名师精解l这篇文章讲的是年轻人如果要父母帮忙照看孩子，要适可而止，因为老人应当照顾好自己的身体。 [解题秘籍] 注意第一段的it's time to reconsider 的语气。

单选题 If a grandma is willing to look after her grandkids, she should be ______.

A. encouraged
B. kept at home
C. given breaks
D. paid

【正确答案】 C

【答案解析】[解析] 答案在第二段的最后一句：If your mom helps out，make sure she has breaks during the day，as well as“vacations”at regular intervals. [解题秘籍] 这里的break指休息。

单选题 Young people should be careful asking their parents to help with child care because ______.

A. it is risky for their children
B. it is hard job for old people
C. they don't know how
D. it's not good for their health

【正确答案】 D

【答案解析】[解析] 这是整篇文章的中心思想：作者谈到老人更应照顾自己的身体，同时还谈到social isolation是疾病的主要根源。如果成天在家里带孩子，会与世隔绝而生病。 [解题秘籍] 这里谈到带孩子的两个不利因素：没有时间照顾自己身体，还有孤独。