We eat __________ in the afternoon.[ ]
A. breakfast
B. lunch
C. supper
答案：B
急性淋巴细胞白血病（）
A.氨甲蝶呤
B.阿霉素
C.DA方案
D.环磷酰胺
E.VP方案
A racetrack turn would be better than a Williamson turn in recovering a man overboard if（）.
A.the man has been missing for a period of time
B.the sea water is very cold and the man is visible
C.there is thick fog
D.the wind was from astern on the original course
