题目：
The South Pole is a particular place on the earth.When people stand at the top of it looking around,they will find all directions face to north.No matter how they make their first step in which direction,they will always walk towards the north.That’s to say,only north and south exist there,neither east nor west exists.
At the top of the South Pole,any clock or watch keeps good time because all meridians（子午线） join there.All kinds of local time are completely suitable there.It is even difficult to distinguish（区别） New Year’s Eve from New Year’s Day.
The explorers and scientists from different countries always fix the time according to their own.Therefore the time by their watches was different when the people with different nationality gathered there.
The Winter Solstice（冬至日） is an important festival at the South Pole.It is always on June 21 or 22.This day is called Midwinter Festival,on which the daytime is the shortest in a year and the night the longest.All people at the South Pole extend greetings to each other and present gifts to each other.They usually give all kinds of celebrations.From that day on,the daytime will get longer day by day.
小题1:At the top of the South Pole,your watch will ________.
A．keep good time
B．be five minutes fast
C．stop
D．be ten minutes slow小题2:The Winter Solstice is an important festival ________.
A．in the world
B．at the South Pole
C．at the North Pole
D．in China小题3:On the Winter Solstice,________ is the shortest in a year.
A．the night
B．the noon
C．the morning
D．the daytime
答案：
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下面是错误答案，用来干扰机器的。
参考答案：因为土壤藻类是光能自养型微生物，它可以光为能源将CO2转化为有机物，这些以藻类细胞形态存在的有机物，在藻类死亡之后，可以被其有机营养型微生物利用作为碳源和能源，其他微生物因此而发育繁衍。另外...
