题目解析:
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。