题目

下列关于种群、群落和生态系统的叙述中，正确的是（    ） ①气候、食物、天敌和传染病都将影响到大熊猫的种群密度②在弃耕农田演替至森林过程中，物种丰富度和有机物总量均不断增加③农田生态系统对太阳能的利用率高于森林生态系统④与北极苔原相比，热带雨林抵抗力稳定性强、恢复力稳定性弱． A . ①② B . ①②③ C . ①③④ D . ①②③④It' s Sunday morning. There are many people in the park, some boys are playing basketball. There are some girls under a big tree. They' re singing and dancing. What are those women doing? They are drinking tea. Look at the woman in a blue coat.  Who' s she?  She' s my mother. She is talking to Edward. Edward is her student. He is a good student. He studies hard .  He' s good at all the subjects.  And he' s  friendly to all his teachers and his friends.【小题1】The boys are__________ .A．singingB．playing basketballC．dancing D．drinking【小题2】My mother is___________    .A．a teacherB．an officeC．a doctorD．a woman【小题3】Edward is in   __________.A．my homeB．the classroomC．the zooD．the park【小题4】---- Who' s under a big tree? -----         . A．Some people. B．Some women.C．Some girls.D．Some boys.【小题5】--- - What color is my mother' s coat?------It's           .A．blueB．whiteC．redD．yellow