新东方语法教程的几个语法问题

enjoylife517

1、不是很清楚，大概就是说在天空的1/4处，或者是说划过1/4的天空。

2、这个是表示先后的一个并列。大多数人可能不会意识到精神威胁的严重性，而把那种威胁性看得相对轻一些。

3、uniform是一个形容词，不是名词，所以这里have要用系动词are。

加油！

eaglewang821

from：exercise24-30

1. Under (the certain) conditions, a rainbow appears at the end (of) a (rain shower) in (the quarter) of the sky opposite the sun.

答案是a，in (the quarter) of the sky opposite the sun.是什么意思啊？

from exercise25-27

2. Someone (may) refuse (to recognizing) the seriousness of an emotionally threatening situation and (perceive as) less (threatening).

答案是B，觉得意思不是很理解，特别是最后的(perceive as) less (threatening).

from exercise25-39

3. (Due to) persistent inbreeding, self-pollinating plants (have) genetically more uniform than cross-pollinated plants, (which) harbor more genetic (variability).

答案是B，原因不明