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填空题

【参考答案】

that —that
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填空题is ∧species —a

单项选择题Which of the following is TRUE

A．Environmental changes must have caused the end-Permian mass extinction.
B．Massive volcanic eruptions might have caused the end Permian mass extinction.
C．The disappearance of dinosaurs was a consequence of the end-Permian mass extinction.
D．Marine animals appeared as a result of the end-Permian mass extinction.

填空题it ∧ used —was

填空题and —but yet

填空题would ∧ have —not