题目

When we were very small, we realized that having friends was important.Some of us even had imaginary(想象中的)friends. The need for friends continued as we grew into our teens.Friends played a big part in forming our personalities(性格). As adults，it is still important for us to have friends. True friends are people who like us though we made mistakes and who listen to us and tell us the truth. Friends support our decisions and tell us when we’re foolish. They laugh with us and share our sadness. They are our partners and share interests with us. They stimulate us when we are feeling有人分析某种小分子样品，发现含有C、H、0、N、P等元素，该样品可能是A. 氨基酸 B. 核酸 C. 蔗糖 D. 核苷酸