题目

短文填空 请用适当的词完成下面的短文,每个空只能填写一个形式正确、意义相符的单词。 In the past(过去) there lived a man in a small town called Zheng. One day he wanted to buy himself a new pair of (1)________ . He measured (测量) his feet with a ruler first and (2)________ down his size on a piece of paper. Then he went shoe shopping. When he arrived at the shoe shop, he put his hand into his pocket(口袋), but he found (3)________ paper was not here. So he said to the salesman, “I left the measurement at home and don’t know the size. I’ll2、下列关于基因结构的认识中,正确的是 A.小麦细胞基因的编码区中存在非编码序列 B.花生细胞基因结构中内含子存在于编码区中,是能编码蛋白质的序列 C.金黄色葡萄球菌的基因与RNA聚合酶结合位点位于编码区的下游 D.乳酸菌与酵母菌基因结构中,都存在外显子和内含子
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