单项选择题

Dr. Wang has made much contribution to the theories of modem physics at the ______ of his health.

A. cost
B. disposal
C. mercy
D. expenditure
<上一题 目录 下一题>
热门 试题

单项选择题
His speech rambled for half an hour, but the ______ of what he had said was that too many people has too little money.
A. aim
B. purpose
C. essence
D. content
单项选择题
The reason why he has been such a success is ______ he never gives up.
A. what
B. that
C. because
D. how
相关试题