某班级举办主题为“中国科学技术成就”的图片展览。下列图片应入选“宋元篇”的是
A.①②
D.③④
答案:D
. Mike’s newly-bought car ______ in the great fire last month.
A.was burnt down
B.was burned up
C.burned down
D.burned up
什么叫活线?