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举一反三
【单选题】Walk like ____________ elephant. [     ]
A.
a
B.
/
C.
an
【单选题】Would you like _______ after dinner? [     ]
A.
walk
B.
have a walk
C.
to take a walk
D.
walking
【简答题】命题:“若a,b,c成等比数列,则b2=ac”及其逆命题、否命题、逆否命题中正确的个数是  ▲  .
【简答题】. What is “Walk to School”? Now we are working on a programme of “Walk to School”. We would like as many parents and children as possible to take part, even if in a small way. Children who walk to and...
【简答题】会议的票证包括参加各种活动的____、餐券和旅游券。
【单选题】Do you feel ___ a walk?
A.
like to take
B.
like taking
C.
taking
D.
to take
【单选题】命题:①“公差为0的等差数列是等比数列”; ②“公比为 1 2 的等比数列一定是递减数列”; ③“a,b,c三数成等比数列的充要条件是b 2 =ac”; ④“a,b,c三数成等差数列的充要条件是2b=a+c”, 以上四个命题中,正确的有(  )
A.
1个
B.
2个
C.
3个
D.
4个
【单选题】下列命题中,正确的是(  )
A.
数列{a n }一定是等比数列
B.
若a、b、c是实数,且b 2 =ac,则a、b、c一定成等比数列
C.
若数列{a n }相邻两项满足a n =qa n-1 (q是常数),则{a n }一定成等比数列
D.
若a、b、c是实数且 a -b = -b c ,则-a、b、-c成等比数列
【单选题】I don't feel like ______ now. I prefer to have a walk after supper. [     ]
A.
walk
B.
walking
C.
to walk
D.
walks
【单选题】下列命题中正确的是(  )
A.
公差为0的等差数列是等比数列
B.
a,b,c成等比数列的充要条件是b 2 =ac
C.
公比 q= 1 3 的等比数列是递减数列
D.
a-b b-c =1 是a,b,c成等差数列的充分不必要条件
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