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【单选题】
化学性皮肤灼伤主要由于（）等化学物质引起。A.
强酸、强碱、氢氟酸和磷
B.
强酸
C.
强碱
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举一反三
【单选题】—Excuse me, sir. Could you help me? —Sure ?
A.
What is that
B.
What is it
C.
What help
D.
What do you want
【单选题】--Excuse me, what time is it now? --Let me see. It’s .
A.
half past ten
B.
three quarters
C.
one minute
D.
thirty
【单选题】People think that the pure scientist usually disregards the application of pure science to practical affairs, ______ his attention to explanation of how and why events occur.
A.
refining
B.
defining
C.
confining
D.
declining
【单选题】Pure science, leading to the construction of a microscope ______.
A.
is not always as pure as we suppose
B.
necessarily results from applied science and the discovery of a cell
C.
may lead to antiscientific, 'impure' results
D.
necessarily precedes applied science, leading to the discovery of the cell
【单选题】Pure science, leading to the construction of a microscope ______.
A.
is not always as pure as we suppose
B.
may lead to anti-scientific 'impure' results
C.
necessarily results from applied science and the discovery of a cell
D.
necessarily precedes applied science, leading to the discovery of the cell
【简答题】A．At all the entrances. B．At some entrances. C．At all the exists. D．At some exists.
【单选题】已知化学反应2C(s)+O 2 (g)=2CO(g)，2CO(g)+ O 2 (g)=2CO 2 (g)都是放热反应。下列说法不正确的是 [ ]
A.
12gC(s)所具有的能量一定高于28gCO(g)所具有的能量
B.
56gCO(g)和32gO 2 (g)所具有的总能量大于88gCO 2 (g)所具有的总能量
C.
12gC(s)和32gO 2 (g)所具有的总能量大于44gCO 2 所具有的总能量
D.
将一定质量的碳燃烧，生成CO 2 比生成CO时放出的热量多
【简答题】听力原文：What time will the plane to Milan leave? Man: Excuse me. What time is the next plane to Milan? Woman: It should leave at quarter past seven but it's an hour late today. Man: That's a problem. If ...
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