The performance of Class A students is much better than ___of Class B students
A. this
B. those
C. one
D. that
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What I’d like to say about how to improve our spoken English is like___.．
A. this
B. that
C. it
D. those
He admired those who looked beautiful. 这里使用those作指示代词正确吗？
A. 对
B. 错
He admired that who danced well.that放在这里，正确吗？
A. 对
B. 错
二进制无记忆信源（每个符号的出现是独立的），已知“0”符号出现的概率为1/4，则该信源的熵（平均信息量）为（）bit/符号。
A. 1.121
B. 0.812
C. 0.418
D. 2.212
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