比热是指单位质量物质每上升1℃所吸收的（）。
A、热量
B、重量
C、水分
D、硫化氢
参考答案：A
—Tom looks very sad. What’s wrong _______ him?
—An accident happened _______ his father this morning.
A．to; with
B．with; to
C．for; to
D．with; for
OutlookExpress中实现的邮件安全协议是（）。
A、POP3
B、IMAP
C、SMTP
D、S/MIME
