正确答案: A

原始社会

题目：艺术活动产生于人类的______时期。 ( )

解析：A

查看原题

举一反三的答案和解析：

[单选题]The word "arid" is closest in meaning to ______.

dry

[单选题]中国植物群落分类的高级单位是（ ）

植被型

[单选题]下列生态因子中，对生物起间接作用的是( )

坡向

[单选题]Jonathan and Joe left the house to go for__ after supper.

a walk

解析：【考情点拨】考查固定搭配。 【应试指导】句意：晚饭后，乔纳森和乔离开了房子去散步。go for a walk是固定用法，意为“出去走走，去散步”，与take a walk同义。

[单选题]The article suggests that______.

our earth used to be part of a high mountain on the sun

解析：

48．答案为D  从最后一段及its tidal pull had become so powerful that this mountain was torn to pieces and threw off small parts of itself into space可推断地球也是在太阳爆炸的小碎片中形成的。

[单选题]Some scientists believe that hibernation is started by ______.

a body chemical