China is now facing a very serious environment problem, that is Sandstorm (沙尘暴)．Now  this problem becomes worse and worse．

330,000-ton sand fell on Beijing on April 18^th, 2006．This is the tenth instance(情况) of sandstorms in northern China this year and the eighth in Beijing．Most of the sand in Beijing comes from Inner Mongolia．The situation this year is worse than the past two years．

People had to clean the dust-covered(灰尘湮没的) roads by washing instead of sweeping．The sandstorms this year could appear because of high temperature, long droughts(干旱) and frequent(经常发生的) cold air．

From March, the rainfall in northern China is about 75% of the average figure (平均数) in the past few years and some parts reported rainfall to be about 20% of the average figure in the past few years．

Cold air is frequent (惯常的)in March and April in northern China and it brings strong wind and sandstorms to the areas．

1．The environment problem becomes               

A．more and more                                      B．worse and worse

C．drier and drier                                            D．less and less

2．How many tons of sand fell on Beijing on April 18th,2006？

A．33,000             B．333,000           C．330,000            D．3,300

3．How did people clean the dust-covered roads?

A．By sweeping                                           B．By rainfall

C．By sweeping and washing                          D．By washing

4．          causes the sandstorms this year besides (除)high temperature, long droughts．

     A．Frequent cold air．                                B．Rainfall

C．Heavy traffic                                           D．Sand

5．Sandstorms often appear in northern China in           ．

A．January and February                                 B．March and April

C．Summer                                              D．Autumn