题目内容
Exercises that bend the bone will stretch the bone cells thus strengthening the bone health.
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What really matters to strengthen the bones is to bathe the bone cells in fluid rather than stretch them, because the latter is almost unlikely to achieve.
Text ALearning special phrasesChoose the best answer to explain the underlined phrases in the following sentences.(1) But when she called her doctor's office, he was booked solid, and her symptoms didn't seem to strike anyone as terribly worrisome. (Para.2)
(2) Besides, five months earlier, when she'd been feeling light-headed and tired, she'd undergone a treadmill stress test and had been given a clean bill of health. (Para.3)
(3) A few months ago, a shocking study suggested that as children pile on the pounds, they're putting stress on blood vessels and ratcheting up the likelihood of cardiovascular problems in the future. (Para. 5)
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