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【单选题】
()是信息赖以存在的前提,是信息安全的基础。A.
网络安全
B.
应用软件
C.
设备与环境的安全
D.
以上都不对
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【单选题】______ the 1500s ______ the first European explored the coast of California.
A.
It was not until... when
B.
It was until... when
C.
It was not until... that
D.
It was until... that
【单选题】B In the 1500s，the camera was invented． However，in the early 1800s people found a way to make the pictures permanent． Even then，photography was a new field． Most families had their pictures taken by p...
A.
In the 1500s．
B.
In the 1600s．
C.
In the 1700s．
D.
In the 1800s．
【单选题】_______ the 1500s ____ the first Europeans explored the coast of California.
A.
It was until…then
B.
It was not until…when
C.
It is until…that
D.
It was not until…that
【单选题】Whose possession has the house _________ since the 1500s?
A.
taken
B.
been taken
C.
been in
D.
come into
【单选题】During the early 1500s the English were content to stay home for the reasons EXCEPT that _____________.
A.
English had driven away most foreign merchants out of the country
B.
population had grown fast
C.
merchants had become very wealthy
D.
the country had not broken away with the Catholic Church
【单选题】某商场第一季度的销售额比去年同期销售额增长了4％，该商场的综合价格指数比去年上涨了5％，则该商场销售量增长了( )。
A.
2％
B.
-0．95％
C.
0．96％
D.
-0．96％
【单选题】It () the 1500s () the first European explored the coast of California.
A.
was not until / that
B.
is not until / that
C.
is not until / when
D.
was until / that
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