If we do_______, soon there may be no tigers left in the world.

A. something B. nothing C. everything D. anything

B 【解析】句意：如果我們什么也不做，很快世界上就不會有老虎了。四個選項皆為不定代詞，A. something某事、某物；B. nothing什么都沒有；C. everything每件事； D. anything任何事。根據(jù)句意可知此處為 “什么都沒有”的意思。故選：B。
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