题目

在一个双链DNA分子中，脱氧核苷酸数为a，腺嘌呤碱基数为b，则下列有关数量关系式错误的是   A.鸟嘌呤的数量为a-b                B.碱基总数=磷酸数=a C.两条链中A＋T的数量为2b            D.碱基之间的氢键数为a-b 答案：AHer son ________ coke, but now he ________ milk.A.used to drink; is used to drinkingB.used to drinking; drinksC.is used to drinking; used to drinkD.is used to drink; is drinking