—No, Mom. I did it very carefully.
A:something wrong
B:wrong something
C:anything wrong
D:wrong anything
我国空间技术跻身于世界先进国家行列的标志是( )
“白夜”是指高纬度地区太阳处于地平线以下,但天空整夜不黑的现象。读图 ,关于“白夜”现象的说法,正确的是( )