He was ill , _______he still went to school on time.[ ]
A. but
B. and
C. or
D. /
答案:A
下列城市中太阳辐射能最丰富的是( )
A.武汉
B.拉萨
C.乌鲁木齐
D.重庆
下列化学用语中,书写正确的是( )
A.2个氢离子H2+
B.氧化铁FeO
C.五氧化二磷P2O5
D.硫酸铝AlSO4