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【单选题】
What does the author suggest as a solution to the problem?A.
The government should charge carbon emissions so as to encourage companies to adopt new technology.
B.
The government should reward utilities that invest in technologies to reduce carbon emission.
C.
The government should make long-time efforts to encourage people to plant more trees.
D.
The government should pay for large-scale carbon emissions.
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皮皮学刷刷变学霸
举一反三
【单选题】硫酸的电离方程式正确的是（ ）
A.
H 2 SO 4 =H 2 +SO 4 2-
B.
H 2 SO 4 =2H +1 +SO 4 -2
C.
H 2 SO 4 =2H + +S 6+ +4O 2-
D.
H 2 SO 4 =2H + +SO 4 2-
【多选题】写出与120°角终边相同的角的集合; 写出与-30°角终边相同的角的集合。
A.
{ β | β =120°+ n ·360° ， n ∈ Z }
B.
{ β | β =-30°+ n ·360° ， n ∈ Z }
C.
{ β | β =120°+ n ·180° ， n ∈ Z }
D.
{ β | β =-30°+ n ·180° ， n ∈ Z }
【简答题】写出与 终边相同的角的集合________________________.
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