狭义的宝石是指自然界产出的()。
A.矿物单晶体
B.矿物集合体
C.单矿物
D.多矿物
参考答案:A
--- A robot dog provides you with unconditional love, gentleness and undemanding attention.
--- _____ Does it do what every small dog is supposed to do?
A.That’s reasonable advice.
B.Isn’t it a good idea.
C.Do you think so
D.I can’t agree more.
根据我国农业部2003年2月的《优势农产品区域规划》,大豆、油菜、甘蔗、棉花四种农作物的优势生活区域如下图所示.读图回答问题.
图例①代表______ ②代表______,
③代表______ ④代表为______.