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【简答题】
观察下列各式：① 1+ 1 3 =2 1 3 ；② 2+ 1 4 =3 1 4 =3；③ 3+ 1 5 =4 1 5 ，…请用含n（n≥1）的式子写出你猜想的规律：______．
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举一反三
【单选题】Many foreigners in England have considerable difficulty making themselves ______.
A.
to understand
B.
to be understood
C.
understood
D.
understand
【单选题】The students' criteria for selecting majors today have much to do with ______.
A.
their understanding of the contributions of others
B.
their own interpretations of the courses
C.
the influences of their instructors
D.
the financial goals they seek in life
【简答题】汽车转向操纵机构主要由( )、( )以及( )等机件组成。
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