如图所示，O是杠杆OA的支点，在力F作用下，OA水平时杠杆刚好处于平衡状态，在图中画出OA的重力G的示意图和力F的力臂L．
Read and complete.（完成对话内容）
1. James: It's ______（温暖的）today. Let's play football.
Mike: Great!
2. Mary: Can l wear my new T-shirt?
Mom: No, it's ______（寒冷的）, put on your coat.
3. Mike: Mum! It's ______（炎热的）today.
Mum: Put on your T-shirt.
4. Bill: It's warm today.
Mum: _____ ______（脱下）your jacket.
衡量生产力发展水平的客观尺度是( )
A．劳动者技术水平的高低 B．劳动产品质量的好坏C．劳动资料特别是生产工具的发展水平 D．劳动对象的广度和深度
