小猫钓鱼。
① Have some grapes. ____ A. Thank you.
② Can I have some strawberries? ____ B. Yes, I do.
③ Do you like watermelons? ____ C. Me, neither.
④ I don't like apples ____ D. Sure. Here you are.
⑤ Here you are.____ E. Sorry, I don't like grapes.
I can see a spoon.
—For about an hour.
①氨基酸 ②C,H,O,N 等化学元素 ③氨基酸分子相互结合 ④多肽 ⑤肽链 ⑥形成具有一定的空间结构的蛋白质分子.
一小船以相对于静水不变的速度垂直河岸渡河(河宽处处相等),当小船运动到河中间时,水流速度突然增大,则小船渡到河对岸实际所用时间比预定时间( )