What's wrong _____ your clock? [ ]
A. on
B. with
C. of
D. to
答案：B
He accidentally _____ he had quarreled with his wife and that he hadn’t been home for a couple of weeks.
A．let out
B．tried out
C．ran out
D．made out
取一定量可能含有Cu(NO3)2、AgNO3、KNO3三种物质中的一种或多种成分的粉末，加热后得到A气体a L，将气体用足量的水吸收，剩余气体B的体积为a/6 L。下列相关推测正确的是
A．NO2与O2的体积比为5：1
B．气体B可能是NO2
C．NO2与O2的体积比为2：1
D．固体粉末的组成为n[Cu(NO3)2]：n(AgNO3)：n(KNO3)=1：3：1
