单项选择题

The（）of such I. Q. tests full of questions on American culture was not questioned at that time.

A. significance
B. validity
C. efficiency
D. justification

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单项选择题
In certain types of quartz, bands of color form an irregular pattern（）

A. shades
B. cautioned
C. motivated
D. requested
单项选择题
He wears strange clothes, talks to himself, and appears unkempt. Is it any wonder his neighbors view him as an eccentric（）

A．a crank
B．cuckoo
C．an anchorite
D．unconventional
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