1995年8月、哪颗卫星成功定点在印度洋上空、泛美公司成为第一个拥有全球卫星通信网的私营公司（）
A、泛美-3
B、泛美-4
C、泛美-2
参考答案：B
女性几岁仍未开始性发育应考虑有性发育迟缓问题（）。
A.13岁
B.10岁
C.16岁
D.18岁
E.20岁
The little boy didn't know______. [ ]
A. which hat is his
B. which hat his is
C. which hat was his
D. which hat his was
