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答案：E
解析：
The structure of the sentence indicates that the statement after the colon gives an example of the idea in the first part of the sentence. If Alvin is unselfish, he likely “assists,” or helps, his friends without expecting anything from them in return. And helping people without expecting anything in return is an example of being “altruistic,” or unselfishly concerned with the welfare of others.
| 重點單詞 | 查看全部解釋 | |||
| colon | [kəu'ləun] |
想一想再看 n. 冒號，結腸，科朗(哥斯達黎加和薩爾瓦多的貨幣單位) |
聯想記憶 | |
| concerned | [kən'sə:nd] |
想一想再看 adj. 擔憂的，關心的 |
||
| unselfish | ['ʌn'selfiʃ] |
想一想再看 adj. 無私的 |
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| caustic | ['kɔ:stik] |
想一想再看 adj. 腐蝕性的，刻薄的，[物]焦散的 |
聯想記憶 | |
| altruistic | [,æltru'istik] |
想一想再看 adj. 利他的；無私心的 |
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| critical | ['kritikəl] |
想一想再看 adj. 批評的，決定性的，危險的，挑剔的 |
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| statement | ['steitmənt] |
想一想再看 n. 聲明，陳述 |
聯想記憶 |
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