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【简答题】
公路隧道按其长度分类可分为短隧道、中隧道、长隧道、特长隧道，中隧道长度为() 1)L≤250 2)1000>L>250 3)3000≥L≥1000 4)L>3000
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【单选题】— Excuse me, could you tell me ? — There is an e–shop on the third floor. You can repair it there.
A.
where can I repair my MP4 player
B.
where I can repair my MP4 player
C.
how can I go to the e–shop
D.
how I can go to the e–shop
【单选题】— Excuse me, could you tell me____________? — There is an e–shop on the third floor. You can repair it there.
A.
where can I repair my iPad
B.
where I can repair my iPad
C.
how can I go to the e–shop
D.
how I can go to the e–shop
【单选题】Why can DNA repair and replicate with high fid e lity?
A.
Genetic information is encoded in the linear sequence of fo ur kinds o f subunits of DN
B.
The continuity of inherited traits has been preserved in the structure of DNA for million of years.
C.
The structure of DNA is rigid enough to resist any damage and error during repair an d replication.
D.
DNA double helix contains two complementary s t rands, one serves as a t emplat e fo r the synthesis of the other.
【单选题】下列有关荒漠化的说法，正确的是（）
A.
荒漠化是当今全球最严重的环境问题之一
B.
我国是世界上荒漠化最弱的国家之一
C.
我国的荒漠化问题是近代开始出现的
D.
我国的荒漠化问题已基本得到治理
【单选题】甲、乙两地目前主要的环境问题是( )
A.
．都以土地荒漠化为主
B.
．都以水土流失为主
C.
．甲以土地荒漠化为主，乙以水土流失为主
D.
．甲以水土流失为主，乙以土地荒漠化为主
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