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【单选题】
用适当的方法表示集合:大于 3的所有实数组成的集合A.
4,5,6,7,8…
B.
{4,5,6,7,8…}
C.
{x|x>3, x ∈ N }
D.
{x|x>3, x ∈ R }
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举一反三
【单选题】听力原文：The national forestry industry has seen a large increase in the demand for lumber over the last 12 months. According to forestry statistics, revenues increased by 21 percent to $1.2 billion. The ...
A.
The shortage of workers in the industry.
B.
The elimination of forestry regulations.
C.
The increase in home construction.
D.
The addition of new technologies.
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【单选题】It is good that we have large national parks, _____ wildlife enjoys proper protection. [ ]
A.
whose
B.
which
C.
where
D.
what
【单选题】In the National Zoo we can find______ animals that range from large beasts to Small birds.
A.
a species of
B.
a group of
C.
a variety of
D.
an amount of
【单选题】The national park has a large collection of wildlife, _________ from butterflies to elephants.
A.
ranging
B.
range
C.
to range
D.
ranged
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