As is known to us all, under no circumstances______ temporary economic development at the expense of the environment and resources.

A．should we seek

B．we should seek

C．we had sought

D．had we sought

未经医师注册取得执业证书的（）

A.不得从事医师执业活动

B.可在执业医师指导下，在预防、保健机构，从事医师执业活动

C.可在保健机构从事医师执业活动

D.可在预防机构从事医师执业活动

E.可在执业医师指导下从事医师执业活动