Newtown is a good place ________ yourself. [ ]
A. enjoy
B. enjoyed
C. to enjoy
答案:C
衡量一个国家基础工业发展水平标志之一的工业部门是[ ]
A.煤炭工业
B.石油工业
C.钢铁工业
D.电子工业
用多普勒超声早在第几周能显示胎心搏动()。
A.4~5
B.6~7
C.8~9
D.10~11
E.12周后