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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】-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
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