设某传输码序列为+1-100-1+100+1-1000-1+100-1，在接收端正确

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问题单项选择题

设某传输码序列为+1-100-1+100+1-1000-1+100-1，在接收端正确恢复出的数字序列为（）。

A.110011001100011001

B.201102112011102110

C.110001000100001001

D.100000000100001001

答案

参考答案：D

单项选择题

TNF-α主要是由哪类细胞产生()

A．单核/巨噬细胞

B．红细胞

C．B淋巴细胞

D．树突状细胞

E．静止T淋巴细胞

听力题

根据句意和汉语注释，写出单词的正确形式。

小题1:_______ (污染) air does harm to our health. It’s necessary to keep the air fresh and clean.

小题2:Our success was far _______ (超过) what we thought possible.

小题3:This kind of disease _______ (传播) so quickly that it drew the government’s attention.

小题4:The man kept remembering English words every day until he was in his _______ (四十).