67．A volunteer is usually expected to work within a year for at least______．
(A)24 hours
(B)36 hours
(C)48 hours
(D)72 hours

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詳解 (共 1 筆)

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细节理解题。注意题干中所提的at least，定位时需要注意题干中“volunteer”到文中“A Big sister and Little sister”的转换，定位之后，理解“between one and four hours together three or four times each month for at least twelve months.”至少为12个月中3次，每次1小时。得出答案B。
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