There are _____ boys in my class. [ ]A. thirty two B. thir

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There are _____ boys in my class. [     ]
A. thirty two
B. thirty and two
C. thirty-two
D. thirty-and-two

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举一反三

There are ______ people in our school. [ ]
A. two thousands
B. two thousand
C. two thousands of
D. thousand of

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There are _____ books in the reading room. [ ]
A. hundred of
B. hundreds of
C. two hundreds
D. two hundred of

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It is said that ______ young people may lose their abilities to hear after five years if they listen
to MP4 players which are too loud for more than five hours a week.       [     ]
A. thousand of
B. six thousands
C. thousands of

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Every week, Xiao Ying plans to use 180 minutes to practice her listening. According to the table, it
takes her ______ hour(s) to do it on weekdays.[ ]

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完成下列算式。1. ten - four = __________ .  2. one + seven = ___________.
3. seven - three = __________.  4. eight + two = __________.
5. nine - four = __________ .  6. six + one = ___________ .
7. four - two = __________ .  8. ten - seven = __________.
9.five + four = _________ .  10. three - two = ___________ .

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