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10.B【解析】该实验的自变量是PLCEI基因的有无,所以对照组的棵小鼠应注入不含PLCE1基因的结肠癌细胞,A项错误;实验表明:PLCEI基因的表达产物能抑制癌细胞的增殖,可能影响癌细胞的DNA复制将癌细胞大量阻滞在分裂间期,B项正确;细胞癌变与基因突变有关,有致癌因子时,细胞癌变的概率增加,无致癌因子时,细胞也可能发生癌变,C项错误;裸小鼠没有胸腺,T细胞不能发育成熟,可以排除特异性免疫对肿瘤生长的影响,实验组裸小鼠体内部分癌细胞死亡与其细胞免疫无关,D项错误。
本文是一篇说明文。文章主要介绍了一些控制愤怒的方法。36.G空前一句“However,.if anger is frequently expressed,it can prove to be harmful for many rea-sons.”描述了愤怒的危害;空后一句“Let's take a look at some ways that you can manage your an-ger.”引出下文的方法。G选项“So learning to deal with this emotion becomes important.”承上启下,this emotion指代前一句中的anger。故选G项。37.A根据下一句“A recommended way to do with anger and recognize how frequently you have thisemotion is by keeping a journal to track your emotions.”可以推测,A项“Keep a mood journal.”为该段主旨句。故选A项。38.D空前一句“When you feel the obvious signs of your anger building up,try to focus on positivepractices like deep breathing to calm yourself down.”介绍用深呼吸的方法来控制情绪,D选项“Repeat the exercise until your anger is controlled..”是做这项练习的补充说明,且下句中This指代做深呼吸这项练习。故选D项。39.E根据本段主旨句“Reach out to loved ones.”并结合空前一句内容可知,本段描述的方法是向所爱的人倾诉。E选项“They can act as a support group,calming you down.”是这样做的好处,符合语境。故选E项。40.C根据本段主旨句“See a psychologist.”及空前一句内容可知,本段描述的方法是寻求专业的

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