第1个回答 2011-05-27
Wash your hands_A__you have dinner. (饭前请洗手)
A.before B.but C. when D.so
Early men found fire very_B__millions of years ago.(几百万年前,早期人类发现火非常有用)
A.use B.useful C.useless D.uses
Only a quarter of the Earth is_B__.(地球只有四分之一的土地)
A.oceans B.land C.forests D.seas