A:直线型;三角锥形
B:V形;三角锥形
C:直线型;平面三角形
D:V形;平面三角形
用天竺葵进行探究阳光与有机物关系实验的正确顺序( )
①对天竺葵叶片进行部分遮光处理后放在阳光下照射3~4h;
②取一盆天竺葵,放在黑暗处一昼夜;
③用清水漂洗叶片后滴加碘液,观察、比较叶片遮光和未遮光部分的颜色;
④剪下叶片,去掉遮光物,浸入盛有酒精的烧杯中,隔水加热.
——I hope to see Niagara Falls one day. What about going there?——Niagara Falls would be beautiful, but there is not much to do there.