A:甲
B:乙
C:丙
D:无法判断
阳光充足的时候,池塘的水绵丝团会漂浮到水面,原因是水绵释放了较多的氧气.(判断对错)
完形填空
Look! There 1many kites in the2.They are red,yellow and blue.I like 3kites 4 much.But I can't fly very5.My brother Peter can do6 well.He often 7me fly kites.We go out8our kites every Sunday.9my brother's help,now I can fly10.
为提高学生避险能力,某校开展了形式多样的安全教育活动。这体现了对未成年人学生的( )