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【单选题】
神经激素是指( )A.
作用于神经细胞的激素
B.
神经细胞分泌的激素
C.
使神经兴奋的激素
D.
神经系统内存在的激素
E.
以上都不是
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举一反三
【单选题】. By the end of last year the railway_______.
A.
was being completed
B.
would be completed
C.
had been completed
D.
had completed
【简答题】( ) 6. By the end of last term, the students ___1600 new words.A. learned B. have learned C. had learned D. learn
【单选题】.By the end of last week, we_____about twenty English songs.
A.
have learned
B.
had learned
C.
learned
D.
were learning
【单选题】By the end of last term, I___ ten books.
A.
had finished reading
B.
have finish reading
C.
had finish to read
D.
finish read
【单选题】下列关于公钥密码体制说法不正确的是（）。
A.
公钥密码体制中仅根据密码算法和加密密钥来确定解密密钥在计算上是可行的
B.
在一个公钥密码体制中，一般存在公钥和私钥两个密钥
C.
公钥密码体制中仅根据密码算法和加密密钥来确定解密密钥在计算上是不可行的
D.
公钥密码体制中的私钥可以用来进行数字签名
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