在某一类型的血细胞中,一种中性物质的浓度比周围血浆中的浓度高得多,然而此物质仍能继续不断地进入细胞.该物质进入细胞的这一方式是( ) A . 渗透作用 B . 简单扩散作用 C . 易化扩散,即进行得较快的扩散作用 D . 主动运输 答案:D
Our school doesn't ________ students'staying in the classroom too long.We think they should have time for sports.
[ ]
A.advocate
B.admit
C.assess
D.approach