在地球上空均匀配置 _________ 颗同步卫星，就覆盖了几乎全部地球表面，从而实现了 _________ ．
3；全球通信．
The average cost of school residential trips was ￡ 48 in primary schools and ￡ 55 in secondaries in 2003, but ￡ 144 and ￡ 274 in 2009．
A．regularly
B．relatively
C．respectively
D．responsibly
— _______ eat in class.
— Sorry, I won't.
[ ]
A. Do
B. Don't
C. Doing
D. Doing not
