A. create
B. break
C. change
D. decrease
答案及解析:
2.B。 根据文章第四段内容在进行页岩气开采时,先用钻子钻入岩层再注入高压水、沙子或者其他材料到岩层当中,促使岩层开裂释放气体,所以答案是“break”,有“裂开、破碎”的意思。
3. From the passage, we learn that ______.
A. big oil and gas companies only search for gas in their own country
B. gas shale exploration will be taken over by big oil and gas companies
C. there may be huge fields of gas shale under the Appalachian Mountains
D. one fourth of the natural gas in America is coming from gas shale exploration
答案及解析:
3.C。 从第三段Huge fields of gas shale are believed to lie under the Appalachian Mountains, Michigan and the southcentral states可以知道C项正确。
4. Gas shale exploration may cause disagreement because ______.
A. it may cause water pollution
B. it brings too high profits
C. it breaks the law
D. it is out of states' control
答案及解析:
4.A。从倒数第二段的第一句可以得出答案。
5. According to Eric Potter, the new gas shale exploration ______.
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