【单选题】【消耗次数：1】
9.We should really take some effective ______ to prevent such terrible things from happening again.
①
measures
②
steps
③
means
④
ways
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相关题目
【单选题】
—We all had a lot of fun at the barbecue ?yesterday. Pity you weren’t there.
—I really should have gone with ?you but I _______ on some remaining problems.
①
worked
②
was working?
③
would work
④
would have worked
【单选题】
9. Some of the wheat came from Canada. How about _______?
①
another
②
the others
③
the other
④
the rest
【单选题】
We should be pleased to send you some samples of our new printers on approval, _______ our own expenses.
①
at
②
on
③
for
④
in
【单选题】
When we speak to people, we should be ______.
①
as polite as possible
②
as polite as possibly
③
as politely as possible
④
as politely as possibly
【单选题】
An experiment suggests that flowers have some____________ ways of keeping time.
①
modern
②
mysterious
③
military
④
mixed
随机题目
【多选题】
设格中元素a,b,c，则满足下面哪些性质：
①
a?(b*c) ≤ (a?b)* (a?c)；
②
a?(b*c) ≥ (a?b)* (a?c)；
③
A*(b?c) ≥ (a*b)? (a*c)；
④
a * (a ? (b*c)) = a。
【多选题】
设一连通平面图G有 n个顶点, m 条边, r 个面，则下列哪些不是欧拉公式：
①
m - n + r = 2；
②
n - m - r = 2；
③
n - r + m = 2；
④
n - m + r = 2。
【多选题】
关于完全图 Kn (n 3 3)的点独立数b0、点覆盖数a0、匹配数b1与边覆盖数a1，下面的哪些性质正确：
①
b1 a0；
②
b1 a0；
③
b0 a1；
④
b1 ≤ a1。