—Mei will represent our class in the English Speech Contest.

—She is clever and can speak English really well. She will not make us disappointed

A．knock into us

B．care about us

C．let us down

D．help us out

在100度以下加热介质能杀死致病菌和无芽孢细菌，不存在腐败菌，所以巴氏杀菌没有在常温下保持的要求。