题型:补全对话,情景问答 补全对话。(Miss Yu is giving a class. Suddenly some bottles drop out of a student's desk.)T: What's the noise there?.S: Sorry, Miss Yu. 1. T: (Walking over to take a look) Oh, so many bottles.S: I'm collecting bottles.T: 2. S: Because I want to make toys out of them.T: 3. If so, why not put a big paper box at the back of our classroom? Then your classmate can help collect the bottles.S: Thanks for your advice.T: 4. S: Yes, quite a few.T: 5. S: Of course, I'll bring a few here tomorrow. T: Perfect!That's an interesting idea. We can't wait to see the toys you've made. Some bottles dropped onto the floor. Can you show some to us one day?Could you help us make some toys? Have you already made some toys? Why do you collect bottles? 查看答案
题型:单项选择题 直角钢杆OAB可绕固定轴O在下图所示平面内转动,已知OA=40cm,AB=30cm,ω=2rad/s,α=1rad/s2。则图示瞬时B点的加速度为()。A.223.6cm/s2B.200.10cm/s2C.206.16cm/s2D.200cm/s2 查看答案