单项选择题

A．He has learned a lot from his own mistakes.
B．He is quite experienced in training wild dogs.
C．He finds reward more effective than punishment.
D．He thinks it vital to master basic training skills.
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单项选择题
A．besideB．insideC．outsideD．aside
A．beside
B．inside
C．outside
D．aside
单项选择题
The lions in the Gir Forest are especially vulnerable to disease because they______.
A．have descended from a dozen or so ancestors
B．are smaller than the African lions
C．do not have enough to eat
D．are physically weaker than the African lions
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