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【单选题】
. --- Mr Smith, __________ girl wants to see you. --- If that’s __________ girl who has fair hair and wears a red dress, I want to see her.
A.
a; a
B.
a; the
C.
the; a
D.
a; /
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举一反三
【单选题】测定下列金属污染物,水样保存时不能加酸酸化的是 。
A.
Pb2+
B.
Cd2+
C.
Cr6+
D.
Hg2+
【单选题】— Do you want to study in the famous research institute? — Of course, anyone that _______ be chosen may be lucky. [     ]
A.
should
B.
could
C.
must
D.
may
【简答题】设当x=θ时,函数f(x)=sinx+2cosx取得最大值,则cosθ=______.
【简答题】设当x=θ时,函数f(x)=sinx-2cosx取得最大值,则cosθ=______.
【简答题】At first the institute refused to purchase thetelescope, but this decision was _____ revised. A. occasionally    B. consequently C. successively    D. subsequently.
【单选题】在正常情况下不能通过滤过膜的物质是
A.
血浆白蛋白
B.
Na+ 、 K+ 、 Cl- 等电解质
C.
氨基酸
D.
葡萄糖
【简答题】设当x=θ时,函数f(x)=sinx-2cosx取得最大值,则cosθ=______
【单选题】An unhappy childhood may have some negative effects on a person's character; however, they are not always ________. [     ]
A.
practical
B.
avoidable
C.
permanent
D.
beneficial
【单选题】在正常情况下不能通过滤过膜的物质是
A.
氨基酸
B.
Na+ 、 K+ 、 Cl- 等电解质
C.
血浆白蛋白
D.
葡萄糖
【单选题】测定下列金属污染物,水样保存时不能加酸酸化的是 。A. Pb2+ B. Cd2+ C. Cr6+ D. Hg2+
A.
Pb 2+
B.
Cd 2+
C.
Cr 6+
D.
Hg 2+
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