In what two ways does the author develop the central idea of the passage? The author presents the differences between light and sound waves.
The author gives examples of how sound travels through various substances and surfaces.
The author describes how different surfaces affect the speed of sound.
The author explains that it is easier to gather information about sound waves.
The author uses light waves to specify how inferior sound waves are at traveling through barriers.

El autor da ejemplos de cómo el sonido viaja a través de diversas sustancias y superficies.

El autor usa ondas de luz para especificar qué tan inferiores son las ondas de sonido para atravesar barreras.

Explanation:

ESPERO HABERTE AYUDADO

in this passage from "animal farm", by george orwell, the statement that best explains how boxer's response supports the author's purpose in writing an allegory is option b) orwell uses boxer's decision to avoid more carnage by working hard to show how the working class was manipulated. boxer and the other animals feel they are responsible for their carnage because napoleon uses propaganda to manipulate the animals of the farm.

explanation:

1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)