其实这道题ETS已经给了大家足够多的额外信息了,看第一句"Scientists have recently discovered what could be the largest and oldest living organism on Earth",很明确的表明了Fungus的两个特性是old和large,那么第一个特性spawned by a single fertilized spore some 10,000 years ago"肯定是修饰fungus,表示fungus在一万年前就被产卵了,而不会是什么tentacles了,接下来第二个特性自然要说是large,那么肯定是(a fungus) extending for more than 30 acres(现在分词表状态)。