单项选择题

(If) you (will buy) one box at the regular price, you would receive (another one) at (no) extra cost.（）

A.If
B.will buy
C.another one
D.no

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

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

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

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