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【简答题】
已知直线l经过点P(2，1)，且与直线2x＋3y＋1＝0垂直，则l的方程是 ▲
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举一反三
【单选题】How many people _____ church every Sunday? [ ]
A.
join
B.
attend
C.
take
D.
take part in
【单选题】Many people believe that ______ will take years to develop a car that does not pollute the air. [ ]
A.
it
B.
that
C.
there
D.
this
【单选题】Rather than ________ a bus, many people in Chongqing prefer ________ to the workplace. [ ]
A.
to take; walk
B.
taking; walking
C.
to take; to walk
D.
take; to walk
【单选题】Many citizens urged their government to take measures to _______ their carbon emission to reduce greenhouse effects.
A.
cut off
B.
cut up
C.
cut out
D.
cut down
【单选题】在单缝的夫琅和费衍射实验中，若减小缝宽a，其他条件不变，则中央明纹【图片】
A.
宽度变小
B.
宽度变大
C.
宽度不变，且中心强度不变
D.
宽度不变，但中心强度变小
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