小伟同学参加军训时，体检称得他的质量为50kg，他立正时对水平地面的压力为 N；他正步走时，他对地面的压强将 （增大/不变/变小）．
490；增大．
I read an article about London in a m 小题1: yesterday.
London is one of the c 小题2: with a long history in Britain. It is also the b 小题3:city in Europe. You can find some of the best theatres and m 小题4: of the world there, such as the National Theatre, the National Gallery(画廊) and so on. You may visit many places of i 小题5: there. Most of the old and f 小题6: buildings are o小题7: the north bank of the River Thames. On the south bank, there are some fine m 小题8: buildings.
If you want to k 小题9: the people there better, you should learn more about the l 小题10: and the culture（文化） as well.
2010年年末，某公司高收入员工（占20%）收入是一般员工（占80%）的6倍。未来5年实现员工总收入增加1倍，同时缩小收入差距，当一般员工收入增加1.5倍时，则高收人员工收入是一般员工的多少倍？( )
A．5
B．4.5
C．4
D．3
