按照C选项,但不管是什么原因,终究还是杀死了藻类。。。这不仍然是一个很有效的方法吗?并没有和结论相悖啊。
唯一的点在于微生物是不是又引入了其他不清洁的 any particles of matter in the water, such as algae cells, that scatter or absorb light will interfere with the collection of heat.
assist sb. in doing sth.
'those of others' is problematic; it should just be 'others' (it's clear that the intention is to refer to other species, not to something of other species).
手打 一下官方解释。。。。:
A: CORRECT. the information presented dose not clearly support a conclusion about whether it's economically beneficial for coal-burning utilities to minimize their coal-purchasing costs. Therefore, utilities relying solely on this information cannot be assured that it is. 我的理解:各类费用具体的临界值不知道,是无法得出确切的选择方案的,所以正确答案说的是might(可能)。
In arguing that this decline of feudalism was economically determined, the Marxist asserted that the Black Death was a relatively insignificant factor. 注意economically 。
按照C选项,但不管是什么原因,终究还是杀死了藻类。。。这不仍然是一个很有效的方法吗?并没有和结论相悖啊。
唯一的点在于微生物是不是又引入了其他不清洁的 any particles of matter in the water, such as algae cells, that scatter or absorb light will interfere with the collection of heat.