问题
选择题
In recent years________global warming is becoming________concern for people all over the world. [ ]
A. the; the
B. /; a
C. /; /
D. the; /
答案
答案：B
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In recent years________global warming is becoming________concern for people all over the world. [ ]
A. the; the
B. /; a
C. /; /
D. the; /
答案：B
A．水受热变成水蒸气，水分子分裂变成了原子