A.多用天然气代替煤和石油
B.废电池与其他废品一起填埋
C.用核能代替水力发电
D.开发太阳能取代煤,天然气供热
答案:D
The newly-built lab is ______ the old one.
A.three times so big as
B.as three times big as
C.three times bigger than
D.three times the size
直接传授式教学的教学形式主要有______。
A.开办讲座
B.小组培训
C.事务处理训练
D.个别指导