七年级下册英语周报31期2020～2021答案

5.T)【解析】田鼠的活动能力强,活动范围大,宜采用标志重捕法调查其种群数量;根据题干信息,种群数量锊天增加1.5%,则当天数量是上一天数量的(1+1.5%)倍,即A=1.015,说明种群在最初的一个月内呈“∫¨型增长;种群昰现“”型增长,表眀其所处的环境中空间充裕、食物充足、气候适宜;种群的出生率与死亡率相等时种群数量达到K值,此时已错过防治鼠害的最佳时期。故选D。

【参考范文】Dear MichaelWe are so glad that you want to join us in oures on Tree-planting Day. You are welcome. We willmeet at the school gate at 7: 30 in the morning and then take the bus to where trees are to be plantedcountry.Don’ t be latePlanting trees on Tree-planting Day is meaningful, but thats not enough. Not untilrealizes theurgency and importance of tree-planting will our world be kept green and beautiful. So in the afternoonwill pay a visit to local families, trying to raise their environmental awareness so that they will take positiveaction to protect nature. I' m sure you will have a wonderful day.Y

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