单项选择题
A．hospital and warm B．out going C．friendly and helpful D．all of the above
A．People want to see the person they are talking to on the phone. B．email is easier than talking on the phone. C．People are using writing and reading more with email. D．email is not private enoug
A．increases the ability to think B．is the best time for thinking C．is better for thinking than is very warm weather D．decreases the ability to think