单项选择题

Boys and girls, we are going to learn ______ today.

A. Four Lesson
B. the fourth lesson
C. the Lesson Four
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单项选择题
The flood happened ______.
A. in the summer of 1998
B. in the summer of 1998s
C. in 1998 of the summer
单项选择题
______ of the surface (表面) of the earth is covered with water.
A. First third
B. Two thirds
C. One three
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