托福听力official32 The word “viable” in the passage is closest in meaning to 答案解析

viable：能养活的； 能自行生产发育的, 对应A选项的able to survive能存活的。对应原文：For example, as many as 1,125 viable seeds per square meter were found in a 100-year-old Douglas fir/western hemlock forest in coastal British Columbia. Viable这个单词同学们普遍了解的那层意思是“可行的”，可以通过这个意思来进行推测，就算有其他意思也不会相差太多。和明显B选项individual（个人的），C选项的large（大的），D选项的remaining（剩下的）明显和“可行的”这层意思不沾边。只有A选项最为合适。且原文的大致是在说在这个树林中发现的可以存活的种子数量之多。