足月正常新生儿体内储铁可供小儿使用多长时间()
A．1～2个月
B．3～4个月
C．4～5个月
D．1～2周
E．3～4周
参考答案：C
典型的胰腺癌可见___________、___________、___________.
The demand for labor will be less elastic:（）
A. at lower wage rates than at higher wage rates.
B. in the long run than in the short run.
C. the less labor intensive the production process.
