人类实现对太阳的逼近观测是在（）。

补偿贸易是指我方企业以销售其产品的方式，偿还外方的贷款的交易方式。 ( )

Can you tell the   ________  difference between the words "require" and "request"?    

I sometimes get puzzled by their meanings. [ ]

A. dramatic          

B. regional      

C. apparent          

D. subtle

My life ____ a lot in the last few years. [ ]

A. change

B. changed

C. has changed

患者久病咳嗽，气短乏力，动则气急而喘，自汗淋漓，气不得续，舌淡，脉虚无力。其病机关系最密切的脏是（）

A.心与肾

B.心与肺

C.肺与脾

D.肺与肝

E.肾与肺