单项选择题

(2001)______more than 100 elements are known to us, only 25 of them are common and important.

A．Although
B．If
C．Because
D．Since
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单项选择题
(2010) Wise people believe only half of what they hear. Wiser ones know ____half to believe.
A．where
B．which
C．that
D．such
单项选择题
(2009)We agree to accept______they thought was the best tourist guide.
A．whatever
B．whichever
C．whomever
D．whoever
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