题目

From mom’s love, patience and understanding, I have learned what a huge responsibility ___ is to raise a child. A. that                  B. it              C. this               D. one   答案:B大豆根尖细胞所含的核酸中,含有碱基A、G、C、T的核苷酸种类共有 [  ] A.8B.7 C.5D.4
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