【单选题】如图 6 所示,水平桌面上有三个相同的物体 a 、 b 、 c 叠放在一起, a 的左端通过一根轻绳与质量为 m = 3 kg 的小球相连,绳与水平方向的夹角为 60° ,小球静止在光滑的半圆形器皿中,水平向右的力 F = 40 N 作用在 b 上,三个物体保持静止状态, g 取 10 m/s 2 ,下列说法正确的是 ( )
【单选题】Woman: I like Miss Black' s lessons. What about you, Mike? Man: I do, too. Her lessons are always interesting. 23. What's the relationship between the speakers?
【简答题】Read and complete. (选择正确的句子,将对话补充完整,把字母编号填在横线上) Mike: Mom, what's the weather like today? Mom: 1._________ Mike: Can I wear my T-shirt? Mom: 2._________ Mike: Where's my T-shirt? Mom: 3._________ Mike...
【简答题】选择恰当的语句,补全对话。 A: Mike. wake up! It' s time for school B: 1 A: It's six o' clock B: What's the weather like today? A: 2 B: 3 A: No, you can't It's cold B: 4 A: That's OK B: 5 A. Can I put on my T-s...