活动扳手是用来扳动螺栓、螺母，启闭阀类，上卸杆类螺纹的工具。
参考答案：对
看一看，数一数，答一答。
1. How many dolls are there?
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2. How many cars are there?
3. How many planes (飞机) are there?
4. How many teddy bears are there?
5. How many ducks are there?
6. How many books are there?
在分析原因时，要注意哪些问题？
