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【单选题】
下列教育家中， 注意到了儿童心理发展的自然特点，主张按照儿童心理发展的规律对儿童进行分阶段教育，这也成为后来强调教育中注重人的发展的思想渊源。A.
亚里士多德
B.
泰洛齐
C.
夸美纽斯
D.
杜威
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举一反三
【单选题】The writer explains the boiling water by using ______.
A.
myths
B.
humor
C.
facts
D.
arguments
【单选题】One of the requirements for producing vapor is that the water ______ to its boiling point.
A.
must be heated
B.
has to be heated
C.
is to be heated
D.
be heated
【单选题】With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by _____.
A.
a brine pump
B.
an air ejector
C.
a feed pump
D.
distillate pump
【单选题】After being boiled in the boiling water, the coffee beans ____________.
A.
became softened
B.
became hardened
C.
made the water taste bitter
D.
made the water taste better
【单选题】The boiling water in the kettle decreases because it ______ into vapor. In other words, it is vaporizing or evaporating.
A.
is being converted
B.
is converted
C.
has been converted
D.
converts
【单选题】Because of the reduced _____ in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.
A.
temperature
B.
water level
C.
pressure
D.
rate of flow
【单选题】Water _____ at 100 degrees centigrade.
A.
boiled
B.
boils
C.
has boiled
D.
was boiling
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