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【单选题】
在SQL Server2008数据库系统中，下列关于model数据库的说法正确的是（）。A.
SQLServer每次重启时，都重新创建model数据库
B.
每次启动数据库引擎时，model数据库的大小被重置
C.
model数据库用作在系统上创建的所有数据库的模板
D.
model数据库是系统数据库，因此不能向该数据库中添加表
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举一反三
【单选题】We have not obtained very much experiment data ______ conclusion between the two possibilities.
A.
on which to base
B.
to base on
C.
which is based on
D.
to be based on
【简答题】Olaf Stapledon wrote a book called First and Last Men, in which he looked millions of years ahead. He told of different men and of strange civilisations（文明）, broken up by long 'dark ages' in between. ...
【单选题】Which of the following is true of Livingston?
A.
He thinks he has discovered a new possibility in the link between sun spots and the weather on the Earth.
B.
He has great doubts about the theory that the sun' s frequent changes have an influenced on the Earth' s climate.
C.
He has been recently informed by other scientists of the possibility that more sun spots will appear.
D.
He does not think the causes of the sun spots will be fully revealed by scientists in the near future.
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