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算法 种类 例句
加法 一般 Five and six is eleven.
正式 Five plus six is (equals) eleven.
减法 一般 Eight take away four leaves (is) four.
Four from Eight leaves (is) four.
正式 Eight minus four equals (is) four.
乘法 一般 Three fours are twelve 3×4=12
正式 Three times four equals (is) twelve.
一般 Two in to four is two.
正式 Four divided by two equals two.
(三) 例题解析
1.- How many students are there in your school, Mike?
?- There are over ___ students in our school.
A. two thousands
B. two thousands of
C. two thousand
D. two thousand of
[答案] C.
[析] 有基数词在前面时thousand， hundred 等词不能加s，也不能加of结构，只有在thousands of时才可以使用。
2.John lives on ___ floor. He doesn't use a lift to go up and down.
A. nine
B. the ninth
C. ninth
D. a ninth
[答案] B.
[析] 序数词前加定冠词，nine 与 ninth 的拼写上有一个e字母相差别。
3.Wu Dong won the girls' ___ race in the school sports meeting last week.
A. 100 metres
B. 100?metres
C. 100 metre
D. 100?metre
[答案] D.
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