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71. When parents cannot afford time to accompany with their children, they could choose to send their children to child-care center where many children are cared together; or they could send their children to an individual caregiver. Which one is better?练习人数： 22
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72.练习人数： 2
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73.练习人数： 14
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74.练习人数： 0
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75.练习人数： 10
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76.练习人数： 0
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77.练习人数： 11
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78.练习人数： 7
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79.练习人数： 7
