读某学校校园及周边环境平面图,学校教学楼东西向长度约为( )
A:20米
B:40米
C:100米
D:200米
如图是四种物质a、b、c、d在化学反应过程中的微观示意图,下列说法中正确的是( )
—Hurray! Actually these competitors were all strong, but our students made it.
Jim____ keeps a diary in the evening.
多音字组词
冲 chōng____ chòng____ 散 sàn____ sǎn____ 奔 bēn____ bèn____