A：磁电式电流表中的磁铁
B：录音、录像磁带上的磁粉
C：电脑用的磁盘
D：录音机磁头线圈的铁芯
I love singing and dancing. I want to be actor in the future.
A. I am 165 centimetres tall.
B. Some people visit museums or parks.
C. They swept the streets with a broom.
D. I weigh 70 kilograms.
E. Students will have a picnic every month. !
在一片森林中，有土壤、水分、阳光、空气，生活着各种植物、动物、微生物，它们共同组成（ ）
