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【简答题】
Some children wish to be writers some day. They want to write stories or books for people to read. That' s good! It' s good to write something for people to read! But they should know that they need to be good readers first before they really are good writers. They should read a lot of books. And read for hours every day instead of watching TV and spending a lot of time doing the reading homework. Then you have time to read many other books for fun. Because of more fun in reading, you want to look for more books to read. Before you decide to be a good writer, you' d better say to yourself, "I must read and read and read and read more and more!"
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举一反三
【简答题】作业:1.阅读理解,2.小作文,3.课后翻译10句,4.背诵单词课文,周六早8点半为止上传学习通。 阅读理解
【简答题】> x y<-data.frame(name=c("王三","王一","王四"),english=c(80,83,92)) 如果要设置将x,y中的共同列中的所有值都合并进来,应写作: merge(x,y,__________)
【单选题】函数y=C 1 e x +C 2 e -2x +xe x 满足的一个微分方程是(    ).
A.
y"-y'-2y=3xe x
B.
y"-y'-2y=3e x
C.
y"+y'-2y=3xe x
D.
y"+y'-2y=3e x
【简答题】已知 > x y<-data.frame(name2=c("王三","王一","王四"),class=c(3,1,2),english=c(80,83,92)) 按照x.name1和y.name2以及x.class与y.class为共同列,合并x,y,并将y中的所有值都合并进入。
【简答题】> x y<-data.frame(name2=c("王三","王一","王四"),english=c(80,83,92)) 如果按照x.name1和y.name2为共同列,应写作: merge(x,y,__________)
【单选题】(2006.II)函数y= + +x 满足的一个微分方程是()
A.
y″-y′-2y=3x
B.
y″-y′-2y=3
C.
y″+y′-2y=3x
D.
y″+y′-2y=3
【单选题】Yesterday Marvin TV for six hours as he was ill in bed.
A.
watched
B.
looked
C.
viewed
D.
saw
【单选题】Yesterday Marvin ___ TV for six hours as he was ill in bed.
A.
saw
B.
watched
C.
Looked
D.
viewed
【简答题】> x y<-data.frame(name=c("王三","王一","王四"),english=c(80,83,92)) 如果要设置将y中的共同列中的所有值都合并进来,应写作: merge(x,y,__________)
【单选题】Yesterday Marvin ___TV for six hours as he was ill in bed.
A.
saw
B.
watched
C.
looked
D.
viewed
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