The children were disappointed by what they did not see

Because they thought they were  going to see something with action.

because you give no pictures of what they don't see

answer; /// the correct answer to the above statement is (a) because of the decline on native american labor forces;

the sentence that best describes the tone of the passage from the radio broadcast compared to the passage from the book is b. the radio broadcast has a more surprised tone.

consider the text evidence: in the passage from the book, the description is more matter-of-fact. it is simply describing the things resembling little grey snakes, but there is no urgency in the description. on the other hand, in the passage from the radio broadcast, there is definetely urgency (you can tell from the expression used, "good heavens", which clearly indicates surprise.)