The student did not catch the last bus, _______, it began to rain cats and dogs.

A．in the flesh

B．at times

C．what’s worse

D．back and forth

中毒有哪些途径（）

A.经消化道吸收

B.经皮肤接触吸收

C.经呼吸道吸入

D.经注入吸收

E.经创伤口、面吸收