问答题

观春色叶的乔木树种有( )、( )、( )、( )。

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校园内有二度开花的植物有( )、( )、( )。

请根据以下内容回答 31～35 题：
Passage Four

第 31 题 The phrase “ a disease that the public still had a lot to learn about”here means a disease that_________ {Page}.
was already well-known then
B． was too complicated for people
C． was still too new to be understood
D． killed too many victims then