---John came to school as early as usual.

---So he did.He comes so early_____ to make the best of time to study.

A．So

B． and

C．but

D．as

1岁小儿，其母近期患开放性肺结核，今前来就诊。

患儿血沉40mm/h，胸部X线可见大小一致，均匀分布的点状阴影密布于双侧肺野，下列哪项是粟粒性结核病的重要指证

A．发热

B．盗汗，消瘦，乏力，食欲减退

C．血沉增快

D．肺内有原发病灶

E．眼底可见粟粒结节