I have to see the doctor because I ________ a lot lately.[ ]

A. have been coughing  

B. had coughed

C. coughed  

D. cough

人们常说，人生三不等：孝老，行善，健身。所谓的“不等”要求我们（）

A.正确区分新与事物旧事物

B.抓住时机促进事物的发展

C.努力探寻事物发展的规律

D.努力促成事物的质变发生