However busy we are, we need to take exercise. Not only___________us keep healthy, it also stops us getting fat.

A．it helps

B．helps it

C．it does help

D．does it help

财产保险可保利益的时效是（）。

A.要求从保险合同订立到终止都具有可保利益

B.只要求投保人在订立保险合同时对被保险人具有可保利益

C.要求保险合同生效后具有可保利益

D.投保前具有可保利益