问题
选择题
My grandmother is too ___________, she can't lift up the heavy box. [ ]
A. old
B. young
C. strong
D. heavy
答案
答案：A
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My grandmother is too ___________, she can't lift up the heavy box. [ ]
A. old
B. young
C. strong
D. heavy
答案：A
氯化钾+氧气
锰酸钾+二氧化锰+氧气
水+氧气
汞+氧气