患儿，男，4岁，平素易感冒，无发绀。体检时发现心前区有Ⅳ级收缩期杂音；疑有室间隔缺损。为明确诊断，下列进一步的最重要而无损伤的诊断方法是（）

A.心电图

B.X线心脏摄片

C.超声心动图

D.心脏同位素造影

E.心导管检查+造影

Yesterday I ________ an old college friend in the restaurant, who was still very ________ about what he ate.

A．came across; worried

B．bumped into; particular

C．knocked into; complained

D．ran into; curious