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【单选题】

The radio program focused on

A.
Harry Houdini's life as an escape artist
B.
the relationship of Houdini with the police
C.
Houdini's techniques for escaping
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举一反三

【单选题】Optical illusions are studied by scientists _____.

A.
whose interested in the ways our eyes deceive our minds
B.
that are designed to fool people
C.
Neither answer is correct.

【单选题】There were many students in the experiment _____.

A.
who were easily distracted by the bouncing ball
B.
whom couldn't see the bouncing ball
C.
Neither answer is correct.

【单选题】One strategy _____ is camouflage.

A.
many animals use for survival
B.
whom many animals use for survival
C.
Neither answer is correct.