肺脓肿治疗上急性期可采用大量有效的（）治疗，转入慢性期后多数采用（）治疗。
参考答案：抗生素；手术
某高校膳食调查结果显示，蛋白质日平均摄入量为60g，脂肪为70g，能量为2400kcal，钙为480mg。 脂肪供能占总能量的比例是（）
A.20%
B.23%
C.26%
D.28%
E.31%
—Tom is never late for work. Why is he absent today?
—Something _____ to him.[ ]
A. must happen
B. should have happened
C. could have happened
D. must have happened
