【单选题】I only caught a glimpse of the thief, so I can't really describe him.
【简答题】蛋白质多肽链中的肽键是通过一个氨基酸的α-氨基和另一氨基酸的______基连接而形成。
【简答题】I can't describe the _____ (sad) I felt seeing someone in so much pain.
【简答题】蛋白质多肽链中的肽键是通过一个氨基酸的 基和另一个氨基酸的 基连接而形成的。
【判断题】Linux系统只能使用光盘安装应用软件。
【判断题】Beowulf is generally considered to be the work of a famous 8th-century Anglican poet.
【单选题】I only caught a glimpse of the thief, so I can't really describe him.