英语周报 七年级下册201答案

【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

2B【解析】衰老细胞中大部分酶的活性下降,但与衰老有关的酶活性不会降低,A项错误;衰老细胞的核膜内折,染色质收缩,染色加深,B项正确;细胞凋亡可将体内不需要的或异常的细胞清除掉,对个体发育有着重要作用,C项错误;被病原体感染的细胞的清除属于细胞凋亡,D项错误。

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