题目内容

This clever ladders and platforms activity is highly_______, yet simple to get the hang of.

A. additive
B. addictive
C. additional
D. added

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The outcome depends on conditions as well as how events_________.

A. unreveal
B. undercover
C. unfold
D. undergo

慢性支气管炎主要症状有______、_______、______。

是引起肺心病的关键环节。

肺心病的诊断标准是以肺动脉瓣下 cm处右心室壁厚度超过 cm。

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