为了研究杀虫灯诱杀斜纹夜蛾的影响因素,科学家释放了一定量的标记过的斜纹夜蛾,适当时间后用杀虫灯诱杀,统计标记个体的个数占释放总数的比例(回收率),结果如下表。下列叙述正确的是(注:横轴为诱捕灯间距) ( )
A:若标记总量为N,回收率为a,则斜纹夜蛾的种群密度为N/a
B:诱捕距离加大,被标记个体占被诱捕总数的比例上升
C:该研究说明,杀虫灯的杀虫效果与灯的密度无关,与灯高有关
D:用杀虫灯诱杀斜纹夜蛾成虫可改变种群年龄结构
eggs, email, had, delicious, traditional
根据句意,用括号内单词的适当形式填空(1)Stop ____ (make) so much noise. My father is sleeping .(2) When I have an exam, I feel____ (worry) .(3) Cathy ____ (go) to school on her bike yesterday.(4)Bicycle is another way of____ (say) bike.(5)You needn't____ (finish) your homework today. You can di it tomorrow.(6) Do you know where Mike____ (live) ?(7) A number of students in our school ____ (be) from the countryside.(8) I take a taxi to work when it____ (rain).(9) There are a few____ (different) between the two pictures.(10) They often go bike____ (ride) on weekends .