17. Professor Smith and Professor Brown will ____ in giving the class lectures.
A. alter B. change C. alternate D. differ
<alter>
alter 改变(把某物改大改小)
change 改变(强调结果)
from...to... 差异
convert 转变(信仰)
converter 叛教者
</alter>
<differ>
differ 不同
differ from 不同
fetch 取来
ferryboat 渡船
conifer 针叶树
cone 圆锥形,松果
</differ>
<conference>
conference (一般性)会议
meeting 会议(口语)
convention 国际大会,风俗习惯
adventure 冒险
summit 高峰,顶点,峰会 (七国首脑会议)
forum 论坛
seminar 学术研讨会
</conference>
<alternate>
alternate adj.轮流的,v.轮流
A.C.:A.lternating C.urrent 交流电
alternative adj.二者择一的,n. 二中择一,其他的
at an alternative 作为另一个选择
</alternate>
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