简要说明社会态度的功能。
参考答案：(1)工具性功能。 (2)知识功能。 (3)价值表达功能。 (4)社会适应功能。 (5)自我防御功能。
---_________ ?
---I’m not sure, but he might have been ill in bed.
A．What do you think has happened to Tom
B．What do you think Tom has happened
C．Do you think what has happened to Tom
D．Do you think what Tom has happened
（）含量增加，将显著增大钢材的冷脆性
A.硫（S）；
B.磷（P）；
C.碳（C）；
D.锰（Mn）。
