8. Education is ____ for the development of a country.
A. indispensable B. accountable C. deliberate D. deficient
<indispensable>
indispensable a.不可缺少的 n.不可缺少之物
</indispensable>
<accountable>
accountable 可计算的
account for 解释，占多大比重
solar system 太阳系
expand 膨胀
black hole 黑洞
gravity 重力
balance 平衡
collapse 崩塌
</accountable>
<collapse>
collapse 崩溃，坍塌
elapse (时间)流逝
lapse 堕落
relapse 旧病复发，回复原状
</collapse>
<deliberate>
deliberate 故意的，深思熟虑的
intention 故意，意图，目的
intentional 故意的
</deliberate>
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