[单选题]
She seemed to have detected some anger in his voice.
A、noticed
B、heard
C、realized
D、got

[单选题]
What can he inferred about completely normally fed mice mentioned in the passage?
A、They will not experience free radical production．
B、They will experience more genetic rejuvenation in their lifetime．
C、They have more old liver genes to behave like young genes．
D、They are more likely to suffer from inflammation．

[单选题]
请在第_______处填上正确答案。
A、with
B、on
C、by
D、at

[单选题]
She was one of the leading writers in her age.
A、successful
B、maior
C、outstanding
D、musical

[单选题]
An infant can recognize a lot of vowels by the time he or she is a year old.
A、Right
B、Wrong
C、Not mentioned

[单选题]
The dilemmas created by the use of internet may be about all of the following aspects，except__________．
A、copyrights
B、inventory control
C、constant monitoring
D、intellectual property