2022英语周报课标版36期答案

第三节One possible version:Paragraph 1Steve and Zach hadnt gone far uhen there toas afamiliar bark. Brady came bounding, stopped directly infront of Steve and hit him with his head, pushing him backtowards the slope. But Steve didnt get it. Then Bradygrabbed the boy4 Jeans and started pulling. The messagewas clear, but Steve hesitated. Of course he rememberedBrady saving his unele's life when the dog was much younger.Was he still sharp enough to get them through this?Paragraph 2Brady pulled again, in spite of the boys disbelief, iurgently. OK, big guy, "seeing the fire was touchingunderbrush nearby, Steve made up his mind.Brady ledthem back down the slope and into the trees. Several timesthe big dog stopped. Often he changed directions to find theright way. The boys were so tired but the dog bullied bothboys to go on. Steve was almost numb when he heard itthe wonderful sound of rushing water! They made it back tothe river

1.℃【解析】与圆粒豌豆相比,皱粒豌豆的DNA中插入了段外来DNA序列,导致基因中碱基对增添,属于基因突变;基因重组发生在减数分裂过程中,而不是受精作用过程中;无子番茄是用一定浓度的生长素处理未受粉雌蕊的柱头,属于不可遗传变异。故选C

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