Read the sentences from Last Lecture by Randy Pausch. And if you’re curious about what zero gravity looks like, hopefully the sound will be working here. [slide shows videotape from Randy’s zero gravity experience] There I am. [laughter] You do pay the piper at the bottom. [laugher, as the people in the video crash to the floor of the plane on the video] So, childhood dream number one, check.

Why does Pausch show the audience a video of his zero-gravity experience?

A. to prove that people are curious about zero gravity
B. to show what being in zero gravity looks like
C. to prove that some astronauts do wear glasses
D. to show that being in zero gravity is painful

Read the passage from sugar changed the world. sugar is a taste we all want, a taste we all crave. people throughout the planet everywhere have been willing to do anything, anything at all, to get that touch of sweetness. we even know exactly how thrilling it was to taste sugar for the first time. when the lewis and clark expedition met up with the shoshone, who had little previous contact with old world products, sacagawea gave a tiny piece of sugar to a chief. he loved it, saying it was "the best thing he had ever tasted." sugar created a hunger, a need, which swept from one corner of the world to another, bringing the most terrible misery and destruction, but then, too, the most inspiring ideas of liberty. sugar changed the world. we begin that story with a man who could never know enough. how does the conclusion of the prologue support the authors’ purpose? select two options. it introduces the topic that will be addressed next. it provides information about the authors. it states why the topic is relevant to readers. it cites sources the authors used in the text. it explains how the authors came to study the subject.