Read the passage from "Zero-Gravity Nutrition.” How can a tiny crumb be an enemy? A crumb may be small but can turn into a big problem in space. A crumb could float and land in an astronaut’s eye. Or it could get stuck in an air vent. It’s the job of food scientists to think about crumbs and other obstacles. They come up with solutions for how astronauts can eat.

Which best states the central idea of the passage?

a)Astronauts get hungry in space just like they do on Earth.
b)Feeding astronauts in space is challenging.
c)Astronauts eat in space while they are weightless.
d)Making food for astronauts is a food scientist’s job.

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.