—Were you late for school this morning, Daming?
—Yes, I was late _______ the heavy snow.
A:thanks for
B:because
C:because of
D:although
Look! It is _______ CD. It's ________ CD.
找朋友。
①我们是____ A.北京
②我们的国名是____ B.五星红旗
③我们的首都是____ C.中国人
④我们的国旗是____ D.中华人民共和国
已知,A={x|x2-3x+2<0},B={x|1<x<a},若A⊂B,则实数a的取值范围是( )
葡萄糖是一种单糖的主要原因是( )