多项选择题

1990年以来，国外地理课程学习方式表现为以下哪些特征（）。
A. 多样化

B. 专业化

C. 人本化

D. 信息化

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单项选择题

We don't visit Tom _____.
A.

as we are used to
B.

as often as we used to
C.

as we were used to
D.

as often as we were used to

单项选择题

动物患“粗颈症”或甲状腺肿大，是由于日粮缺乏微量元素（）。
A、
锰
B、铁
C、锌
D、碘