GMATPrep TEST 1 verbal-28

28. Whereas scientists, because of random fluctuations in the weather, can not determine the transition from one season to the next by monitoring temperatures on a daily basis, so they cannot determine the onset of global warming by monitoring average annual temperatures.

a. Whereas scientists

b. Just as scientists

为什么选b, whereas 不是ETS优选结构么？

这题考的是Just as..., so..的用法

要联系上下文，不能光看选项呀。