问题
选择题
— We are too busy to take _____ holiday at _____ present.
— But I think we'll be able to take _____ two weeks from now. [ ]
A. a; /; one
B. the; /; that
C. a; the; it
D a; /; it
答案
答案:A
— We are too busy to take _____ holiday at _____ present.
— But I think we'll be able to take _____ two weeks from now. [ ]
A. a; /; one
B. the; /; that
C. a; the; it
D a; /; it
答案:A
根据下列材料回答96~100题。
世界煤炭储量在世界能源总储量中占90%,按目前规模开采可持续200年左右。据19世纪80年代初世界能源会议等组织的资料,世界煤炭资源地质储量为14.3万亿吨,其中探明储量为3.5万亿吨,约占24.5%;在总储量中硬煤占75%,褐煤占25%。硬煤可采储量以美国、俄罗斯、中国最为丰富,分别占世界总量的24.8%、21.5%、19.6%,共占。 |
在世界煤炭资源地质储量中,未探明储量占总储量的( )。
A.25.1%
B.74.9%
C.75.5%
D.25%