物料的易碎性系数(),就愈容易粉碎。
A.愈大
B.愈小
C.无关
参考答案:A
一A child’s family background brings him or her a bright future.
一Not really . A study shows that reading for pleasure plays a more important _________.
A.part B.game C.joke
哪种动物会在地下打上几个纵横贯通的洞,把食物藏在最深的洞穴里准备过冬?()
A.灰松鼠
B.鼠兔
C.雪蚁
D.花栗鼠