单项选择题
A. is able to design new tools B. measures the amount of energy used C. enables people to see the muscular movements D. visualizes electrical signals
A. Social Customs and Behaviour. B. Social Life. C. American and British Customs. D. Promptness Is Important.
A．Students who work in the café earn a lot of money． B．At the same time they learn how to run business． C．They also get school credit． D．They give the money they earned to their school too．