1.若一个扇形所在的圆心角缩小为原来的2分之1,半径扩大为原来的2倍.则它的面积扩大为原来的___倍.2.下列说法中错误的是（）A π的值等于3.14 B π的值是圆周长与直径的比值 C π的值与圆的大

1.若一个扇形所在的圆心角缩小为原来的2分之1,半径扩大为原来的2倍.则它的面积扩大为原来的___倍.2.下列说法中错误的是（）A π的值等于3.14 B π的值是圆周长与直径的比值 C π的值与圆的大
1.若一个扇形所在的圆心角缩小为原来的2分之1,半径扩大为原来的2倍.则它的面积扩大为原来的___倍.
2.下列说法中错误的是（）
A π的值等于3.14 B π的值是圆周长与直径的比值 C π的值与圆的大小无关
英语：1.There is __ SPCA officer at the school gate.He's going to give us a lecture on how to protect animals.
A a B an C the D /
2.They spent four ___ yuan building the school library.
A million B millions C million of D millions of
3.-Would you like ___ cup of coffee?
-Yes,please.
A others B the others C other D another
4.Yon can ___ your puppy to a park for a walk every day if you are free.
A make B give C play D take
5.Children enjoy ___ cartoons because they are interesting.
A watch B to watch C watching D to watching
6.Mary loves making paper flowers.She ___ it from her grandma this coming holiday.
A learns B learned C is going to learn D is learning
7.We were ___(luck)enough to catch the last bus and find two seats on it.
8.You can find English books ___(easy)in this library.
9.The movie is very interesting.（改为感叹句）
____ ____interesting movie it is!
10完形填空
This is a story about a famous A___ woman.Her name is Helen Keller.When she was o____ nineteen months old,she got an illness and then became blind and deaf.She c___ see or hear anything.So she couldn't learn to s___.
When she was six,a young teacher came and taught her to read and write.Her name was Ann Sullivan.Later,Miss Sullivan took her to a___ teacher,Sarah Fuller.
Helen began to learn to speak b___ putting her fingers on Miss Fuller's face and lips.
As we know,Helen became on of the few greatest female w___ in the world.

1.若一个扇形所在的圆心角缩小为原来的2分之1,半径扩大为原来的2倍.则它的面积扩大为原来的___倍.2.下列说法中错误的是（）A π的值等于3.14 B π的值是圆周长与直径的比值 C π的值与圆的大
1.扇形面积公式=0.5*圆心角*半径的平方.那么圆心角减半,半径变为原来2倍,面积增大为0.5*2*2=2倍.
2.正如B选项所说,π值是圆周长和直径的比值,是一个无限不循环小数.A是错误的.3.14只是π的近似值.
英语：
1.选A
2.选A
3.选D
4.选D
5.选C
6.选C
7.LUCKY
8.easy
9.What an
10.American only couldn't speak by another writer
三楼真2,π都不知道还回答什么问题啊.

这是六年级的题吗？

1.2 2.C
英语
1.A
2.A
3.D另一杯之意
4.D花费
5.C enjoy +doing
6.B
7.lucked
8.easily
9.How the
10完形填空
American ；only；cannot ；see；acceptable ； by ；writer

大哥好多啊
1.2倍。假设缩小前面积s1，圆心角为a1，半径r1，缩小后面积s2，圆心角a2，半径r2，套用公式。
计算S2除以S1。
2.A是错误的，π约等于3.14
英语给我分再做，累死了打字

楼主，我有点晕