单项选择题

This book has been in the works so long that I have lost ______of most of the sources found for me by the staff of the library.

[A] track
[B] trail
[C] trace
[D] clue
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单项选择题
Which one is NOT the Pope’s image in the President’s eyes
A．A peace-lover.
B．A friend of the poor people.
C．A good friend to Cuba.
D．A quiet and calm person.
单项选择题
The ultimate purpose of the research is to______.
A．have a better understanding of the life of mosquitoes
B．prevent human beings from being bitten by mosquitoes
C．purify the environment
D．keep people alert
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