US President Barack Obama is expecting the economy to show some of recoveryA. attemptsB.

问题补充：

US President Barack Obama is expecting the economy to show some of recovery．

A. attempts

B. signs

C. contents

D. waves

答案：

A. attempts

(答案→)B. signs

C. contents

D. waves

解析：attempt企图；尝试；sign迹象；content内容，所有物；wave波浪。