【单选题】What is the author's attitude towards the idea that 'profit opportunities are rare'?
【单选题】What's Howell's reaction to the study's recommendations?
A.
He is in favor of them.
C.
He is strongly critical of them.
D.
He is indifferent to them.
【单选题】下列关于假二叉分枝的描述正确的是( )
B.
顶芽分化成花芽或自枯,由临近的侧芽代替延长生长,形成了曲折的主轴。
C.
具有对生叶的植物,在顶芽停止生长或分化成花芽后,由顶芽下两个对生的腋芽同时生长,形成叉状侧枝,新芽的顶芽侧芽生长活动与母枝相同。
【简答题】下图是生长素作用与其浓度关系图。课本上说:“一般地说,低浓度促进植物生长,高浓度抑制植物生长。”看图理解这句话,回答下列问题: (1)曲线 段明显促进植物生长,则该范围的生长素浓度为(高、低) 浓度。 (2)向光生长的幼苗,其背光面浓度 于向光面, 于B点。 (3)具有顶端优热的植物,其侧芽浓度 于顶芽, 于B点甚至C点。
【单选题】_____ playing dumb with teachers. They know very well their students.
【单选题】_______ playing dumb with teachers.They know very well their students.
【单选题】举办大型活动需提前()个工作日向公安消防机关申请安全许可