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【题目】The ______ of new inventions(发明) should be to make life easier, not to make it harder.

A. rules B. subjects C. secrets D. purposes

【答案】D

【解析】句意:新发明的目的应该是使生活更容易,而不是使它更困难。A. rules 规则;B. subjects主题;C. secrets机密;D. purposes目的。结合句意可知,答案为D。

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