问题

Radium salts, which have been found to _____ in bones, give rise to cancers of the bone.

A:pile up
B:build up
C:keep up
D:pull up

正确答案是：

同类题型

下列各句中，加点的成语使用不恰当的一项是（）

we work at English, the better grades we will get.

What a nice bike! Where ____ you ____ it

Little Jim’s speech sounds ＿＿＿＿＿.

I’m not a little tired today after giving the room a thorough cleaning and I have never had ____ today.