听句子，选最佳答语（）

A.No，they aren't

B.They'er black

C.They are his pens

A.She is five

B.She is my friend

C.She is in China

(1)How carelessly of you to leave all the windows opened whenyou go to the work？

(2)She was usually heard sing thissong while worked in the fields.

(3)I wonder why you should get all the students keep silence allthe time.

(4)There are some people support it.

(5)I am still care about your safe.

(6)I 'm very like animals.

(7)Our work is study when we at school.

(8)Some people didn't want leave, they were eager to see the manthey for.

(9)Those who wants to go home next week need to get his teacher's permission first.

I am not sure whether I can get any profit from the business, so I can't make a(n)______ decision abut what to do next.

A．exact

B．denied

C．sure

D．definite

设非负矩阵A∈Rn×n，若A有正特征向量x，则对所有m=1，2，…和i=1，2，…，n，有

，其中Am=(ij(m))．特别地，若γ(A)＞0，则对m=1，2，…，都有γ(A)－1Am的各元一致有界．

A.Cs

B.Am

C.Cm

D.Pto

E.Z