苯与乙烯相比较，下列叙述正确的是[ ]
A．都容易发生取代反应
B．都能被酸性KMnO4
C．苯不能发生加成反应
D．都能在空气中燃烧
答案：B
Their English teacher has many different ways _______ this _______. [ ]
A. makes, interest
B. making; interesting
C. to make, interesting
D. to make; interested
When you do not understand a word,you can _ in this dictionary.[ ]
A. look it up
B. look them up
C. pick it up
D. pick them up
