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【单选题】
下列叙述中不正确的是 :A.
H 2 O 2 分子构型为直线形；
B.
H 2 O 2 是弱酸；
C.
H 2 O 2 既有氧化性又有还原形；
D.
H 2 O 2 和 K 2 Cr 2 O 7 的酸性溶液反应生成 CrO 5 。
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【单选题】请问哪个选项可以更好地把句子补充完整？The World Wildlife Fund has declared that global warming, _____________________________, will create havoc among migratory birds by altering the environment in ways harmful to their...
A.
a phenomenon that most scientists agree is caused by human beings in buring fossil fuels
B.
a phenomenon that most scientists agree is caused by fossil fuels burned by human beings
C.
a phenomenon that most scientists agree is caused by human beings' buring of fossil fuels
D.
a phenomenon that is caused by fossil fuels burned by human beings