问题
选择题
Unit 5 is on ______ page(页),and Unit 6 is on page ______. [ ]
A. twentieth; thirtieth
B. the twentieth; thirty
C. twenty; thirty
D. twentieth; the thirty
答案
答案：B
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Unit 5 is on ______ page(页),and Unit 6 is on page ______. [ ]
A. twentieth; thirtieth
B. the twentieth; thirty
C. twenty; thirty
D. twentieth; the thirty
答案：B
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基牙，弯制卡环多采用（）