下列计算错误的是[ ]
A.(-7)+(+5)=-2
B.(-7)-(-5)=-2
C.(-7)×(-5)=35
D.(-7)+(-5)=-2
答案：D
无色透明溶液中放入铝片，产生大量氢气，该溶液中肯定可以大量存在的离子是
A．Fe2＋、K＋、Cl－、NO3－
B．Na＋、K＋、CO32－、Cl－
C．Na＋、Al3＋、NO3－、SO42－
D．K＋、Na＋、Cl－、Br－
Jim, how nice your car is! How long ________ you _________ it? [ ]
A. did; buy
B. did; have
C. have; had
