选词填空（选词并用其适当形式填空）

purple    promise    hundred    taxi    monitor 

小题1:We choose Daming as our class ________. He always helps us.

小题2:Betty ________ never to lie(撒谎) to me from now on.

小题3:Beihai Park is a little far from here. Let’s go there by________.

小题4:This kind old man is not rich but he helps ________ of poor children.

小题5:It’s too cold today. His lips(嘴唇) change into________ .

黑血法的错误概念是（）

A.是预饱和血管成像技术

B.可以显示脑组织中的黑核、红核

C.利用预饱和脉冲使流体和固定组织加以区别

D.预饱和技术可以成功的选择性去除动脉或静脉

E.进入层面未经预饱和的血液呈黑色