问题
填空题
编码20种氨基酸的遗传密码共有（）个。
答案
参考答案：61
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编码20种氨基酸的遗传密码共有（）个。
参考答案：61
Sally is a nice girl. 小题1: She isn’t tall. 小题2: She has two big eyes and a big nose. Her mouth is small. 小题3: Her hair is short and brown. 小题4: But today she is in a yellow T-shirt, blue pants and brown shoes. She has a white cat. 小题5: 任务型阅读：把A—E五个句子填入空白处。（5分）
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