单项选择题
A．The electricity had gone off during the night． B．Bob had set the alarm wrong． C．Bob did not want to be late． D．The Internet had informed the radio of a traffic jam．
A. understood B. was puzzled about C. was glad to hear D. didn’t understand
A. they do not have time for physical activity B. they do not know the suitable physical activity C. getting into physical activity is not so difficult D. getting into physical activity is the most difficult part