单项选择题

The boss's promise to increase the workers' pay was a（）to union demands.

A．concession
B．recession
C．submission
D．commission

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单项选择题
Are you still （） that the climbers can be rescued

A．enthusiastic
B．optimistic
C．pessimistic
D．domestic
单项选择题
His body temperature has been （） for 3 days, the highest point reaching 40.5 degree centigrade.

A．uncommon
B．abnormal
C．disordered
D．extraordinary
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