单项选择题
Where are(危险货)()carried on board?
A. dangerous goods
B. safe goods
C. A or B
D.A+B
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单项选择题
It shows mourning when you lower()(半旗).
A. half-mast
B. dip the mast
C. flag line
D. flag mast -
单项选择题
rise()
A.上涨
B.下降
C.大米
D.稻谷 -
单项选择题
quarantine officer()
A.检疫官员
B.海关官员
C.卫生官员
D.港务局长
