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Model: Though it was brief, it had been spent in that big old house.Brief as it was, it had been spent in that big old house.Though he was poor, he was honest.

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Though I admire him much as a writer, I do not like him as a man.

Although he is a child, he knows a lot.

Though he worked hard, he didn’t finish the work satisfactorily.

___和_构成核苷，_和磷酸构成核苷酸，核苷酸通过_相连接，构成核酸。生物体中主要含有两类核酸，其中主要分布在细胞核中的是_，在细胞质中的是___。