A:①③
B:②④
C:①②③
D:只有④
4.7272…是( )小数.
This is our n ____h____. Look! We have a s____ and a TV in the living r____. We have a f____ and a t____ in the kitchen. In the bedroom we have s____ dolls on the bed and a c____ on the desk. I l____ my new home.
下列有关组成生物体的化合物叙述正确的是( )