在Excel工作表中,单元格引用的3种类型是、和混合引用。
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在Excel中输入公式时必须以 作为开头,然后才是公式的表达式。（写符号，不写中文）
Mary is a _______ pupil.
A. nine year old
B. nine-years-old
C. nine-year-old
D. ninth-year-old
— Where can we find the interesting lesson you are talking about?— It is in ________.
A. Lesson Six, Second Book
B. Lesson Sixth, the Book Second
C. the Sixth Lesson, Two Book
D. Lesson Six, Book Two
________ is less than ________.
A. One fourth…three quarter
B. One quarter…three fours
C. One fourth…three quarters
D. One quarters…three fourths
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