A：含有大量Al3＋的溶液：Na＋、NH4＋、SO42－、Cl－
B：碱性溶液：Na＋、Ca2＋、SO42－、CO32－
C：含有大量Fe3＋的溶液：Na＋、Mg2＋、NO3－、SCN－
D：含有大量NO3－的溶液：H＋、Fe2＋、SO42－、Cl－
____是中国人在一千多年前发明的，当时使用的燃料是火药。
听独白，完成信息记录表。
How far is the school from Peter's home?
It's about kilometers.
How does Peter go to school?
He goes .
How many students are there?
There are students.
Where is the park?
It's the school.
What does Peter do in the park?
He plays with his friends.
图中，大圆和小圆分别表示地球赤道、极圈，箭头表示地球自转方向，阴影部分表示夜半球．其中，表示泰安冬季的图是（ ）
