题目内容
【题目】There are many (学说) about the origin of life.
【答案】theories
【解析】句意:关于生命的起源有许多学说。many后面接可数名词的复数形式,故填theories。
练习册系列答案
相关题目
【题目】Your promise is nothing unless it is ________.
A.figured outB.carried outC.dropped outD.stood out