自然界的矿物,根据其晶体的空间结构,属于骨架结构的是()。
A.卤化物
B.石英
C.石墨
D.辉锑矿
参考答案:B
在下列各句的空格内填上一个适当的完整的单词,该词的首字母已给出。
小题1:The population of the earth is i____________ very fast.
小题2:A radio host usually says, “Good evening to all our l__________!” at the beginning.
小题3:Teachers and parents always e __________us to get good grades.
小题4:The band played many songs, i___________ some of my favorites.
小题5:The postman is very hard-working, and he sends the packages to their o ______day after day.
唐代天文学家僧一行是世界上第一个测出子午线长度的人,主持编写的《授时历》是当时最精密的历法。()