【单选题】【消耗次数：1】
There____alotoftrafficatthistimeofday,soyoudbetter____morecareful.
①
has;be
②
have;been
③
is;be
④
are;are
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相关题目
【单选题】
I hope ___ the little ___ I have been able to do has been of some use.
①
that; that
②
/; by which?
③
what; what
④
/; with which
【单选题】
This book has been in the works so long that I have lost _____of most of the sources found for me by the staff of the library.
①
trace
②
trail
③
track
④
touch
【单选题】
He has been writing the essay the whole morning and he still ＿＿＿ .
①
has been
②
does
③
has
④
is
【单选题】
He has been writing the essay the whole morning and he still ＿＿＿ .
①
has been
②
does
③
has
④
is
【单选题】
The disappearance of her paper has never been _____.
①
counted for
②
looked up
③
accounted for
④
checked up
【单选题】
The new technology has been ( ) in the industrial production.
①
utilized
②
possessed
③
elevated
④
focused
随机题目
【单选题】
设盒中有10个木质球，6个玻璃球，玻璃球有两个为红色，4个为蓝色；木质球有3个为红色，7个为蓝色，现从盒中任取一球，用A表示“取到蓝色球”；B表示“取到玻璃球”。则P（B\A）＝
①
6/10
②
6/16
③
4/7
④
4/11
【单选题】
若二事件A和B同时出现的概率P(AB)＝0，则下列说法正确的是？
①
A和B不相容（相斥）
②
A,B是不可能事件
③
A,B未必是不可能事件
④
P（A）＝0或P（B）＝0
【单选题】
函数<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>在点<img class=jc-formula data-tex={ x }_{ 0 } src=https://huaweicloudobs.ahjxjy.cn/ABCC8DCF3CB54080A21570A5BADC633E.png style=vertical-align: middle;/>处有极限是其在该点处连续的（ ）
①
充分条件
②
必要条件
③
充分必要条件
④
无关条件
【单选题】
<img class=jc-formula data-tex=\lim _{ x\rightarrow { 0 }^{ + } }{ \frac { 1-{ e }^{ \frac { 1 }{ x } } }{ x+{ e }^{ \frac { 1 }{ x } } } } = src=https://huaweicloudobs.ahjxjy.cn/7868A6F19C67DC61BB926650C1BA78CE.png style=vertical-align: middle;/>( )
①
0
②
1
③
-1
④
-2