下列途径不会造成艾滋病传播的是 [ ]
A.握手,共进午餐
B.不正当性接触
C.注射毒品
D.母婴传播
答案:A
If you hadn’t taken such a long time to get dressed,we’d __________there by now.
A.be
B.circles
C.is circling
D.be circling
工业上制取粗硅的化学反应是SiO2+2CSi+2CO↑,发生还原反应的物质是
A.CO
B.C
C.SiO2
D.Si