---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

鱼骨卡喉时，较正确的处理方法是（）。

A.吞咽大的干饭团

B.少量多次喝醋

C.看清鱼骨位置，用镊子拿出

D.大量多次喝醋