asking for explaination --NO.84 OG12RC

Ninasun

84题不理解诶~~求大家帮看看吧~~
84. according to the passage, when the authors began their first studies, they were aware that
(A) they would eventually need to design experiments that involved feeding rats high concentrations of protein
(B) tryptophan levels in the blood were difficult to monitor with accuracy
(C) serotonin levels increased after rats were fed meals rich in tryptophan
(D) there were many neurotransmitters whose production was dependent on metabolic processes elsewhere in the body
(E) serotonin levels increased after rats were injected with a large amount of tryptophan


答案是从下面这句得出来的
Our first studies sought to determine whether the increase in serotonin observed in rats given a large injection of amino scid tryptophan might also occur after rats ate meals that change tryptophan levels in the blood.

答案是E

enkyklios

这不很明显吗，the increase……given

Ninasun

enkyklios 发表于 2013-6-10 15:18
这不很明显吗，the increase……given

还是不懂，given只是修饰而已，我选的是C，这句话我看到的是the increase might also occur after rats ate meals that change trytophan...
可以可以详细解释下呀

Ninasun

enkyklios 发表于 2013-6-10 15:18
这不很明显吗，the increase……given

我理解了，谢谢了

laihong

同义词转换  aware that 和observed