1.harmful为形容词,后接名词,排除b,d（affect是v,effection是错误单词）整句话意思应该是：科学家都在观察对于世界气候产生极坏影响的最早迹象.而track只有小路,踪迹,痕迹的意思,所以选a.
2.rather too是固定搭配,稍微……一点.这篇文章读起来稍微有一点难.
1.scientists are watching for the earliest __ of harmful __o
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