1. somber/joyous
2. 
3. slow/rapid
4.
5. plain/severe
6.
7.
        
             
        
        
        
In general Huck is a character who tends to separate himself from people he disagrees with. If someone thinks something in a different way than he does, Huck will be grim about it and won't have the desire for that person to be near him or he won't even listen to them. Often it happens that he has to do it even if he doesn't want to.
        
             
        
        
        
This question is missing the answer options. I have found them online. They are the following:
A. "She reached the end of the street and made one majestic leap..."
B. "The stray cat stalked down the street."
C. "Her walk was proud..."
D. "... she settled over a meal of broken bones, a back alley Cleopatra."
Answer:
The detail that contains an allusion is:
D. "... she settled over a meal of broken bones, a back alley Cleopatra."
Explanation:
As is explained in the instructions, an allusion is a reference to a famous character or person, one whose story - true or fictional - is well known. 
<u>In the passage we are analyzing here, the allusion takes place when the author mentions Cleopatra, a famous queen from Ancient Egypt. By comparing the cat to Cleopatra, the narrator is attributing characteristics of the queen to the animal - dignity, pride, beauty, elegance. </u>The allusion makes is possible for the author to not have to say those words. Since everyone knows who Cleopatra was and what traits and behaviors she was famous for, by simply alluding to her, the author conveys a deeper description.