题干
It is hoped that the president’s visit will_______a better understanding between the two countries.
A：make for
B：count o
C：show off
D：take u
答案(点此获取答案解析）
A
A：make for
B：count o
C：show off
D：take u
都属于萘(结构简式：
)的同系物。则萘和萘的同系物分子组成通式是（ ）