问题
选择题
Mr. Brown is about 90. He is too _______ to look after himself. [ ]
A. old
B. tired
C. hungry
D. busy
答案
答案：A
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Mr. Brown is about 90. He is too _______ to look after himself. [ ]
A. old
B. tired
C. hungry
D. busy
答案：A
”表示氢原子、“
”表示氧原子，表示一个水分子的是（ ）