— John seems happy, even though his wife left him and he lost his job.

— I think he __________ to put on a brave face.

A．will try

B．has tried

C．had tried

D．is trying

关于功能性蛋白尿错误的是（）。

A.可由剧烈活动.发热.受寒和体位等因素引起

B.尿蛋白定量不超过0.5g/24h

C.肾小球通透性增加

D.尿蛋白定性常为++

E.有肾血管痉挛或充血