单项选择题

When was the jigsaw puzzle first invented

A．Not earlier than 1800.
B．1930's.
C．1750 to 1799.
D．Not known.
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单项选择题
It seems that bilingual services like bilingual ballots______.
A．are being phased out in the U.S.
B．are rejected by minorities
C．are approved by the majority of San Fransico's voters
D．are backed up by the government and legislature
单项选择题
Bilingualism could be described as all the following EXCEPT______.
A．bilingualism is equivalent to biculturalism
B．bilingualism is a controversial issue in the U. S.
C．bilingualism has worked in some areas of the U.S.
D．bilingualism helps minorities to function more effectively in English
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