A:①③
B:②③
C:①④
D:③④
HI体积分数
1min
2min
3min
4min
5min
6min
7min
条件I
26%
42%
52%
57%
60%
条件II
20%
33%
43%
65%
①一座____ A.树林
②一片____ B.山
③一群____ C.鲜花
④几朵____ D.鸭子
⑤一堆____ E.红枣
My grandfather ____ ____ ____ a teacher.