单项选择题

Some (animals) have been (regardless) by nearly all societies as a (valuable) economic (resources).（）

A.animals
B.regardless
C.valuable
D.resources

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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

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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