【单选题】【消耗次数：1】
下列不一定是树的是（ ）
①
无回路的连通图
②
有n个结点，n-1条边的连通图
③
每对结点之间都有通路的图
④
连通但删去一条边则不连通的图
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【多选题】
设 G 是 n (n32)阶 n + 1 条边的无向简单连通图, 则以下哪些性质正确：
①
存在顶点 v, d(v)33；
②
所以顶点度数之和等于2(n + 1)；
③
至少有两个顶点不是割点；
④
奇度顶点个数可以不是偶数个。
随机题目
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She happily deposits the money she has earned teaching English in her savings account. Find any misplaced modifier in the sentence
①
happily
②
she has earned
③
in her savings account
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Well have a picnic in the park this Saturday [] it rains or it is very cold.
①
since
②
if
③
until
④
unless
【单选题】
There were some chairs left over[] everyone had sat down.
①
when
②
until
③
that
④
where
【单选题】
These candidates have vague notions of serving the company, [] they have never taken trouble to find out the actual tasks they will be required to do.
①
or
②
and
③
but
④
so
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Which sentence is correct?
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On entering the classroom, the students stood up and said, Good morning!
②
On entering the classroom, the teacher was greeted by the students with Good morning!
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①
When
②
ours
③
arrived
④
earlier
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People dont like to buy books in this bookstore with hard covers. Find any misplaced modifier in the sentence.
①
this
②
with hardcover
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People in Anhui are proud of [] they have achieved in the last ten years.
①
that
②
which
③
what
④
how
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Which sentence is correct?
①
To look at a map, the importance of this new railway will be seen.
②
You have only to look at a map to see the importance of this new railway.