【单选题】【消耗次数：1】
We feel it is high time that the Government ____
something to check the inflation.
①
did
②
do
③
should do
④
would do
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相关题目
【单选题】
We feel it is high time that the Government _____something to check the inflation.
①
did
②
do
③
should do
④
would do
【单选题】
— Do you want to go to see a movie?— ______________ I feel like doing something different.
①
Dont mention it.
②
Yes. I want it.
③
Not really.
④
Adeal.
【多选题】
_____________ , computers can do many of the things we do, but faster and better.
①
In time
②
In fact
③
Actually
④
As a matter of fact
【单选题】
We are interested in the weather because it __________ us so directly --- what we wear, what we do, and even how we feel.
①
benefits
②
affects
③
guides
④
effects
【单选题】
If I ___ it, I would do it in a different way.
①
were to do
②
do
③
had done
④
was to do
【多选题】
Why do you forget something? What is the reason? You did not learn it_________ . This is the major reason for forgetting.
①
in the beginning
②
at the beginning
③
at first
④
at last
【单选题】
I really do not know whether we can succeed, so do
not expect ____.
①
too much of us
②
us too much
③
of us too much
④
us of too much
【单选题】
—How do you feel about your family life? — .
①
Good. It’s a good choice to work there.
②
Not bad. I think it is a good choice to be a full-time mother.
③
Not bad. I have visited their family a lot of times.
随机题目
【判断题】
设 Ri 是 X 上的二元关系, 对于 x∈X 定义集合Ri(x)={y|xRiy}. 如果 X={-4, -3, -2, -1, 0, 1, 2, 3, 4}, 且令R2={|x, y∈Xùy-1y+2}，则R2(-1) ={ -2, -1}.
①
正确
②
错误
【判断题】
公式“x$y(F(x, y) ù G(y, z)) ú $xH(x, y, z)”中的全称量词x的辖域为：$y(F(x, y) ù G(y, z)) 。
①
正确
②
错误
【多选题】
在全总个体域下，用一阶逻辑将命题“在北京卖菜的人不全是外地人”符号化不正确的有：
①
?x(G(x)), 其中, G(x): x 是外地人.
②
?x(F(x) ù?G(x)), 其中, F(x): x 在北京卖菜, G(x): x 是外地人.
③
?x(F(x) ?G(x)), 其中, F(x): x 在北京卖菜, G(x): x 是外地人.
④
$x(F(x) ? ?G(x)), 其中, F(x): x 在北京卖菜, G(x): x 是外地人.
【多选题】
用等值演算法推导公式“(pù?q) ú (qù?p)”和下面哪个公式等价:
①
(púq) ù? (pùq)
②
? (p?q)
③
? ((p?q) ù (q?p))
④
(púq) ù (?pù?q)
【多选题】
在全总个体域下，用一阶逻辑将命题“凡是汽车就比火车慢，这是不对的”符号化，下面正确的有
①
?xy(F(x) ùG(y) ?H(x,y)), 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.
②
$x$y(F(x) ùG(y) ù?H(x,y) ), 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.
③
?x (F(x) ?y (G(y) ?H(x,y))), 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.
④
$x$y(F(x) ùG(y) ??H(x,y) ), 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.
【多选题】
设个体域 D={a,b,c}, 消去谓词“xy(F(x) úG(y))”中的量词后的形式，下面不正确的有：
①
(F(a) ùF(b)) ùF(c)) ù (G(a) úG(b) úG(c))；
②
(F(a) ùF(b) ùF(c)) ú (G(a) ùG(b) ùG(c))
③
(F(a) ùF(b) ùF(c)) ? (G(a) ùG(b) ùG(c))；
④
(F(a) ùF(b) ùF(c)) ù (G(a) ùG(b) ùG(c)).