A:-1<k<-12
B:0<k<12
C:0<k<1
D:12<k<1
扩句
①松鼠是动物
②生态保护区生长着银杉树。
③我怀念朋友。
Robert had a comfortable childhood, ______ up in a pleasant house with a view of the sea.
a÷b=c(a,b都大于0),当b<1时,( )