抢救溺水者时不正确的做法()。
A.尽量从后面接近
B.溺水者浮在水面时,可以向他抛投木板、竹竿等
C.无论是否危险,都要马上跳下去救人
D.采用正确的方法救人
参考答案:C
补全对话。
A: Shall we visit Monkey Island on Sunday?
B: I'd _____ (1) _____ (2). But _____ (3) can we go there?
A: By _____ (4). My father _____ (5) a very nice boat. We can use it.
B: That's great. I like to sit _____ (6) a boast. Is it _____ (7) enough?
A: Sure. It's not dangerous _____ (8) all.
B: What shall I_____ (9) with me?
A: Some food and water. We'll have a picnic _____ (10) the island.
关于鸡卵的结构叙述错误的是( )
A.受精卵的胚盘将来发育成雏鸡
B.在母鸡体内受精卵开始发育
C.卵黄和卵白都为胚胎提供主要营养
D.煮鸡蛋时有气泡冒出,说明卵壳上气孔