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

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

出自：河南城建学院大学英语四

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