伤寒患者排菌最多的时期是（）
A.起病后第1周
B.起病后第2~4周
C.起病前1周
D.起病后第5周
E.起病后第6周
参考答案：B
某品牌电脑的成本为2400元，标价为3150元，如果商店要以利润不低于5%的售价打折销售，最低可打______折出售．
The boy _____ in the corner with his back _____ to his father. [ ]
A. seated; turned
B. seating; to turn
C. to sit; to be turned
D. sitting; turning
