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题目内容
（河南城建学院大学英语四）
9. (单选题) According to some scientists, many animals may be trained to do given jobs if they know （ ）.(本题1.0分)
A、 who their trainers are
B、 they will get a reward
C、 they will be praised by their trainers
D、 something dangerous will happen to them
A、 who their trainers are
B、 they will get a reward
C、 they will be praised by their trainers
D、 something dangerous will happen to them
参考答案