引起伤寒暴发流行的主要原因是()A．常有生活密切接触史 B．苍蝇密度过大 C．蟑螂孳

While travelling, I had to Charge up my digital camera every day as the battery _______quickly. [ ]

A. shut up

B. ran out

C. ended up

D. turned out

“多学近乎智，无知即无能”。说明知识的掌握与智力的发展是同步的。（ ）

A “fifteen-pound” CO₂ extinguisher is so called because（）.

A.there are fifteen pounds of CO₂ in the container

B.the container，when full，weighs fifteen pounds

C.the pressure at the discharge nozzle is l5 psi

D.the empty container weighs fifteen pounds

有以下程序： main() { inta;char c=10； float f=100.0;double x； a=f/=c*=(x=6.5)； printf("%d %d %3.1f %3.1f\n",a,c,f,x)； } 程序运行后的输出结果是 ______。

A．1 65 1 6.5

B．1 65 1.5 6.5

C．1 65 1.0 6.5

D．2 65 1.5 6.5

钻石分级师用10倍放大镜通常能看见（）及以上大小的内含物。

A.5чm

B.6чm

C.7чm

D.8чm