装修时使用涂料可能会引起机体过敏，主要是由涂料中哪种成分引起
A．漆酚B．VOCsC．铅D．铬E．镉
参考答案：A
_____ makes his parents proud is _____ his son has been admitted by Beijing University.
A．That; because
B．That; what
C．What; that
D．What; because
将金属X置于氧化铝溶液中，X表面没有固体析出；而将其置于硝酸银溶液中，会发生反应：X+2AgNO3=X(NO3)2+2Ag。由此可判断X、Al、Ag的金属活动性顺序为
A．Al＞Ag＞X
B．Ag＞X＞Al
C．Al＞X＞Ag
D．X＞Al＞Ag
