单项选择题

(Alike) light (waves), microwaves (may be) reflected and (concentrated).（）

A.Alike
B.waves
C.may be
D.concentrated

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单项选择题
The (scientific) revolution of the early 1900s (affected) education by (change) the nature of (technology).（）

A.scientific
B.affected
C.change
D.technology
单项选择题
The young parrot (is) totally (dependence) on (parental) care after (hatching).（）

A.is
B.dependence
C.parental
D.hatching
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