问题
选择题
My brother is really ________. He often works in his office far into the night. [ ]
A. openminded
B. hardworking
C. selfconfident
D. warmhearted
答案
答案：B
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My brother is really ________. He often works in his office far into the night. [ ]
A. openminded
B. hardworking
C. selfconfident
D. warmhearted
答案：B
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）聚变生成一个氦核（
）的同时放出一个电子