In the story "The Rockpile," two brothers (Roy and John) are not allowed to play on the rockpile. However, this is what all the children in the neighbourhood do. As Roy believes that this is a necessary part of living in the area, he decides to go anyway, and asks John to keep his secret. However, Roy is injured, and when he is brought home, it is John who is accused of being irresponsible.
The fact that studies have been done to document the effects of acupuncture is correct. None of the other choices, though they are included in the article, provide evidence that can be accounted for . They merely provide information to help readers understand what it was not how it actually worked
This is a SIMILE - if words such as 'as' or 'like' are used in order to compare two things (in this case, 'giant rocks with razor edges crouch LIKE a sea monster with wide open jaws'), then it is a simile.
