铅球重4____
篮球重650____
乒乓球重4____
杠铃重50____
导弹部队是现代化军队不可缺少的、主要担任核反击任务的部队。我国导弹部队组建于20世纪（ ）
– What do you think Sally will be when she grows up?– She loves science so much. I think she'll be an .
铅球重4
篮球重650
乒乓球重4
杠铃重50