29.【答案】B解析:DNA分子的基本组成单位是脱氧核苷酸,每个DNA分子中通常都会含有4种脱氧核苷酸,A正确;在DNA分子中,一般情况下每个脱氧核糖上连接2个磷酸和1个碱基,B错误;1分子脱氧核苷酸由1分子碱基、1分子磷酸和1分子脱氧核糖组成,因此DNA中碱基数=磷酸数=脱氧核糖数,C正确在双链DNA分子中A=T,C=G,D正确

Paragraph IWhen Mrs. Meredith heard of John's idea, she thought it was a good onetoo. Very soon the children learnt how to pop the corm and then were busy indoing this "big thing. At the same time, their mother went out to buy the paperbags that they needed. When she came back, she brought with her BernardBernard felt grateful to all of them for what they had done for himParagraph 2With everything ready, Bernard started out on his new business. Much soonerthan could be expected, he returned with an empty basket and so much moneythat he had never seen before. He was so delighted that he could hardly speakbut his bright smiling face spoke for him. For many weeks, every Saturday, thethree children would prepare popcorn for Bernard to sell. This little boy thereforecould help support his family. All of this was because of John,'s bright idea

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