单项选择题

1. 塑料是由（）和（）组成的。
A、树脂添加剂
B、树脂填充剂
C、增塑剂填充剂
D、润滑剂助剂

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儒艮上浮时将什么露出水面？

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Which illustration best describes “call and response”?

A．.Someone asks a question, and someone else answers.
B．.Two people arguing.
C．.Someone is shouting at a crowd.
D．.A mother is singing a lullaby to her baby.