船舶施放三长声后再二短声的应变信号表示()
A、左舷有人落水
B、右舷有人落水
C、救生
参考答案:A
She always _____ old clothes, but now she _____ a new coat.[ ]
A. puts; wears
B. puts on; puts on
C. wears; wears
D. wears; is wearing
维生素B2主要来源于()。
A.水果
B.奶类
C.蔬菜类
D.动物内脏
E.调味品类