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【单选题】
用盐酸滴定液(0.1000mol/L)滴定20ml NH3·H20溶液(0.1000mol/L)，化学计量点的pH值为（ ）。A.
9.94
B.
9.70
C.
8.72
D.
7.O0
E.
5.27
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【单选题】Which description about tornado is right?
A.
With a tornado, bigger does neccessarily mean stronger.
B.
Some of the smallest tornadoes can not be the most damaging.
C.
Tornado winds are the strongest on Earth.
D.
All of the above are right.
【单选题】Which of the following is NOT the result of a tornado?
A.
Insects are unable to balance themselves.
B.
It is difficult to breathe.
C.
A tornado destroys everything on its path.
D.
A tornado kills 120 people every time it comes.
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