听力原文:M: It's already 7 o'clock. The film will start in 20 minutes. W: Don't worry. It only takes us 15 minutes to get there. Q: When will the film start? (7)
A.
7:05.
B.
7:20
C.
7:15
D.
7:10
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举一反三
【单选题】若函数y=f(x)在区间(a,b)内可导,且x 0 ∈(a,b)则 lim h→0 f( x 0 +h)-f( x 0 -h) h 的值为( )