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【单选题】
听力原文:The new rules call for blood centres to develop more ways to make sure the country's blood supply. According to the speaker,
A.
there are more ways to ensure blood supply.
B.
more ways should be developed.
C.
new rules should be developed.
D.
more blood supply should be called for.
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参考答案:
举一反三
【单选题】Hurry up, or the tickets ________out by the time we get there.
A.
will have sold
B.
will sell
C.
have sold
D.
will have been sold
【单选题】--- Hurry up! We have to get going. --- Just a minute. I ________the paper.
A.
finish
B.
finished
C.
have finished
D.
am finishing
【单选题】Hurry up! Otherwise the play ______ by the time we got there.
A.
will start
B.
will have started
C.
has started
D.
starts
【单选题】玻璃透镜(折射率为1.5)表面通常覆盖一层MgF2的透明薄膜(折射率为1.38),目的是利用干涉来降低玻璃表面的反射。为了使氦氖激光器发出的波长为632.8nm的激光毫不反射地透过,这层薄膜的最小厚度为
A.
114.6nm
B.
229.2nm
C.
458.6nm
D.
171.9nm
【单选题】What could the lion do to bulls at first?
A.
Nothing.
B.
Something.
C.
Everything.
【单选题】-Can you wait for _____________ minutes? -No,we must hurry up, we have __________ time left. [     ]
A.
a little;few
B.
few; a little
C.
a few;little
D.
a little;little
【单选题】用二甲酚橙作指示剂,EDTA法测定铝盐中铝常采用返滴定方式,原因不是( )。
A.
不易直接滴定到终点
B.
Al3+易水解
C.
Al3+对指示剂有封闭
D.
配位稳定常数<10 8
【简答题】用二甲酚橙作指示剂以EDTA直接滴定. Bi 3+ 、Th 4+ 、:Pb 2+ 、Zn 2+ 等离子时,终点由______色变为______色。
【单选题】— We have to stop talking here outsideListen, ______!— Hurry up, or we' be late.
A.
There goes the bell
B.
There does the bell go
C.
There the bell goes
D.
Goes the bell there
【单选题】According to the passage, we know that 'bulls, bears, and bubbles' has a history of about ______.
A.
200 years
B.
250 years
C.
375 years
D.
280 years
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