求助两题逻辑~关于since的题目

嘟嘟饭饭

两题都有Since。我有点昏，有一题是从since 入手说还有其他原因，有一题是质疑结论。昏了~请大牛们解答！不甚感激~~
1. crops can be tradees on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures fall. This morning meteorologists are predicting much-needed rain for the corn-growing region starting tomorrow.Therefore, since adequate moisture is essential for the current crop’s survival, prices of corn futures will fall sharply today.
削弱
 C the rain that meteorologists predict for tomorrow is expected to extend well beyond the corn-growing region.

 D agriculture experts announced today that a disease that has devastated some of the corn crop will spread widely before the end of the growing season.
2,the human body secretes more pain-blocking hormones late at night than during the day.consequently ,surgical patients operated on at night and less anesthesia. since larger amount of anesthesia pose greater risk for patients, the risks of surgery could be reduce by scheduling operations at night.
削弱
A energy costs in hospital are generally lower at night than they are during the day.
E manual dexterity and mental alterness are lower in the late night than they are during the day ,even in people accustomed to working at night.

四月小朋友

我不是牛人啊，答错了莫怪莫怪~一起探讨，一起进步吧~

第一题我选C，第二题我选E，不知道对了吗？

abjure

第一题我选D, 第二题选E。


LS 第一题选C不对，  “beyond the corn-growing region“和 ”corn-growing region“ 无关
D：刚刚看完lawer，感觉很好，
D agriculture experts announced today that a disease that has devastated some of the corn crop will spread widely before the end of the growing season. 属于他因削弱，即corp的少是因为disease.