急性阿米巴痢疾的常用病原诊断方法是（） A.生理盐水直接涂片查滋养体 B.碘液染色法

     It snowed heavily in November, 2009 in northern China. Big snows    1    on Beijing,
Hebei, Shanxi, Ningxia and Xinjiang. For many cities, it was the    2    snowfall in 50
years. The snow made traveling hard. Many schools had to    3    for days. 
     Jia Aizhen, 14, lives in Taiyuan, Shanxi. She    4    have a mid-term test on Wednesday. 
   5    the snow, they had the test on Sunday instead.
      "It was    6    because we had more time to review (复习) our lessons," said Jia, She
enjoyed the snow. It was as deep as half way    7    her leg. "I felt peaceful (平和的) and
relaxed to see the white    8    world."
       Kang Xinyi, 13, and Wang Danyang 13, are classmates at Shijiazhuang No.43 Middle School
in Hebei. Their school    9    on the first day of snowing. Kang said the snow in the yard
was as    10    as 40cm.
      "It was so good    11    we didn't have to go to school!" said Kang Kang. Wang and
another friend had a snowball fight (打雪仗) and    12    snowmen. They also helped clear
snow    13    the roads.
      "I never saw such a big snow," said Wang. "Last year we only made a small snow panda,
but this year our snowman is    14    tall as 1 meter!"
       "If the snow didn't make    15    for traffic, we would hope it would never stop!"
said the girls.