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【单选题】
正弦函数是奇函数，f(x)＝sin(x 2 ＋1)是正弦函数，因此f(x)＝sin(x 2 ＋1)是奇函数．以上推理( )A.
结论正确
B.
大前提不正确
C.
小前提不正确
D.
全不正确
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举一反三
【单选题】If you want to change to a double room you'll have to pay ______ 50 Yuan.
A.
an extra
B.
other
C.
more
D.
each
【单选题】If you want a double room, you will have to pay ____ 50 yuan. [ ]
A.
another
B.
other
C.
more
D.
each
【简答题】They usually ( ) your suitcase at the airport. If the suitcase is more than 50 pounds, you have to pay extra.
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