题目内容

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A. Compression fractures cause the collapse of back bones．
Bone material is lost and cannot be replaced any more．
C. Bones become smaller and weaker and collapse easily．
D. Cushions get compressed with the increased gravity．

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根据录音，选择合适的答案（）查看材料

A. Bones become weaker and break easily．
Bone material changes with time．
C. The back bones press closer together．
D. Cushions between bones break down．

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根据录音，选择合适的答案（）查看材料

A. They are confident with themselves．
B. It helps them focus intensely．
C. They want to review what they"ve learned in the break．
D. It takes them little time to master what they"ve learned．

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