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【单选题】
等差数列 的前n项和为 ,若 , ,则d=A.
1
B.
2
C.
4
D.
8
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皮皮学刷刷变学霸
举一反三
【单选题】下面是某教师的一堂公开课《囚绿记》的导入,这位老师采用的导入设计属于 。 教师在板书课题后,首先提出问题,引起同学们的注意:不同的颜色具有不同的象征意义。比如红色,代表着热情;蓝色,代表着忧郁;紫色,代表高贵;白色,代表纯洁......如果要我们用一种颜色来代表生命,你们会选择什么颜色?
A.
抓住文题，切中文意
B.
以旧引新，自然过渡
C.
情感熏陶，创造佳境
D.
投石激浪，巧设悬念
【单选题】______ difficulties we may have, we must finish the task as required.
A.
Whatever
B.
Whichever
C.
Of which
D.
No matter how
【单选题】A ____ is software that is accessed with a Web browser.
A.
browser application
B.
browser service
C.
Web application
D.
Web service
【简答题】A．recipient B．writer C．sender D．browser
【单选题】We have to finish the task, hard it is.
A.
however
B.
whatever
C.
wherever
D.
whichever
【单选题】We have to finish the task, long it takes.
A.
however
B.
whatever
C.
wherever
D.
whichever
【单选题】____ we have finish the course,we shall start doing more rivision work.
A.
For now
B.
Now that
C.
Ever since
D.
By now
【单选题】We have to ______ our homework right now, or we won't finish it today.
A.
go for
B.
go out
C.
go about
D.
go in
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