第二节书面表达(满分20分)a possible versionSmall Act, Big DifferenceBy LiJinLast Sunday, I took part in a voluntary activity in our neighborhood with many othervolunteers, which was aimed at protecting our environment. Never shall I forget thisexperienceWe gathered at our neighborhood committee at 8: 30 am and started our voluntary workas soon as possible. Some volunteers swept the streets and picked up rubbish from the grassSome put up posters about garbage sorting while others removed advertisements from wallsand doors. What I did was to hand out some brochures to remind people of reducing oushopping. Every volunteer spared no effort to make our environment cleaner and grece ocarbon footprint by getting around on foot or by bike, using reusable bags when gThe activity not only raised peoples awareness of environmental protection but alsostrengthened our sense of social responsibility. Only with our joint efforts can we live in abetter neighborhood. I believe our small act can make a big difference

20.ABC解析:本题考查微生物培养的有关知识。化能自养微生物以无机物氧化反应释放的化学能作为能量来源A项正确;化能异养微生物以有机物作为碳源,B项正确;纯化菌种时为了得到单一菌落,常采用的接种方法是平板划线法、稀释涂布平板法,C项正确;为获得自养型微生物,不能提供有机碳源,D项错误。

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