耐火水泥是由()和结合剂组成的。
A.细耐火骨料
B.粗耐火骨料
C.碳酸钙
D.氧化钙
参考答案:A
I am a boy student in Grade Four.___小题1:____. At school I have three good friends._小题2:____.Xiao Jun is a girl. She is nine years old. She is in Class2, Grade 2. Her eyes are big. Her nose is small and her face is round. Look at the girl. ____小题3:_____ Her mouth is small. She is Xiao Qun, Lei Zi’s sister. She and I are eleven and we are in the same class.____小题4:___ He is short. ____小题5:____.He and Xiao Jun are in the same grade but in different classes.
从方框中所给的选项中选出能填入空白处的最佳选项,补全短文。
青藏铁路北起青海西宁,南到西藏拉萨。高原列车开通后,促进了西藏地
区旅游业的蓬勃发展。读图13,回答下列问题。(12分)
1.说出图示区域主要的能源。(2分)
2.写出图示区域的世界文化遗产, 并说 出该区四种特色旅游资源(自然、人文各两个)。(5分)
3.评价该区旅游资源开发的优势,并指出图示区域进行旅游规划时应优先考虑的问题。(5分)