我国有______个自然保护区被联合国教科文组织列入世界生物圈保护网。
参考答案：I
With the living expense increasing rapidly, I, a fresh clerk in a company, have to take three part-time jobs, which _____ about extra $ 4,000 a year．
A．bring in
B．take in
C．get in
D．put in
下列关于损耗的说法正确的是（）。
A.储发损耗=累计损耗—发货运输损耗—接卸损耗
B.累计损耗=账存—实存
C.本日损耗=本次累计损耗—上期累计损耗
D.原发损耗=原发升数－原发罐车升数
E.运输损耗=罐车应收升数－罐车实收升数
