听第10段材料,回答第17至20题
17.Whatisthetalkmainlyabout?
A.Thehistoryoftheschool.
B.Thecoursesfortheterm.
C.Theplanfortheday.
上一篇 when did the accident happen ?A. at about 8:00 am B. at about 9:00am C. at about 1
下一篇 (Ⅲ)当线段MN的长度最小时,在椭圆C上是否存在这
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