单项选择题
A．Because it was easy down. B．Because it was very expensive. C．Because it was not advanced enough. D．Because it was not as big as the main computer.
A．It is important to be on time for class in the United States. B．The importance of being on time differs among cultures. C．People learn’ the importance of time from the culture they are in. D．Students being late for class should explain the reason to their teacher.
A．Latchkey children feel free at home. B．Working parents often leave their children alone at home. C．Many parents do not admit that they leave their children alone. D．Latchkey children have to learn to take care of themselves.