论文作者单位姓名(()<全称>,();地市;邮编)
参考答案:工作单位;省份
佝偻病颅骨软化多发生于下述年龄小儿()
A.3个月以内
B.3~6个月
C.6~9个月
D.9~12个月
E.12个月以上
For all its extremes, Venus is a(n) incalculable laboratory for researchers studying the weather and climate of earth.
A.invaluable
B.valuable
C.value
D.valueless