TASK DEFINITION: You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.
PROBLEM: Paragraph- Sent 1: Littlefoot 's grandfather one night tells the children a story about '' The Lone Dinosaur '' , a legendary longneck who once protected the Great Valley from the most ferocious sharptooth ever to live .
Sent 2: A fight ensued , which led to the Sharptooth 's death .
Sent 3: However , the sharptooth left '' The Lone Dinosaur '' with a scar slashed across his right eye .
Sent 4: Soon after the battle , a huge monolith that resembled a proud sauropod , having life-sized Sharptooth teeth arranged around his neck , came out of the ground during an earthquake .
Sent 5: The dinosaurs called it '' Saurus Rock '' .
Sent 6: The legend also states that if anyone damages the monolith , bad luck would descend upon the valley .
Sent 7: A few days later when the kids are playing , Littlefoot accidentally falls off a cliff .
Sent 8: Just before he hits the ground , a gruff Diplodocus rescues him .
Sent 9: This longneck introduces himself only as '' Doc '' and gives no knowledge of his history .
Sent 10: Littlefoot is intrigued by this newcomer , who is scarred across one eye and displays prior knowledge of the Great Valley 's topography .
Sent 11: For the preceding reasons , Littlefoot assumes that Doc is the Lone Dinosaur .
Sent 12: He tells his friends this , narrating an apparently extemporaneous legend to support his assumption .
Sent 13: Inspired , Cera 's infant nieces , the twins Dinah and Dana , go to Saurus Rock without anyone noticing .
Sent 14: Later when the friends are playing , they notice that Dinah and Dana are missing .
Sent 15: Recalling their talk of the day before , they go to Saurus Rock to find them .
Question: Who goes missing at the end of the story? (A) Doc (B) Dinah and Dana (C) Dana and Cera (D) Cera and Littlefoot.

SOLUTION: B.

PROBLEM: Paragraph- Sent 1: The idea that Earth is a magnet is far from new.
Sent 2: It was first proposed in 1600 by a British physician named William Gilbert.
Sent 3: Knowing it acts like a magnet is one thing.
Sent 4: Knowing why it acts like a magnet is more difficult.
Sent 5: In fact, finding out why is a fairly recent discovery.
Sent 6: To find out why required new technology.
Sent 7: It was the seismograph that made it possible to learn why the Earth acted like a magnet.
Sent 8: Seismograph are used to study earthquakes.
Sent 9: By studying earthquake waves they were able to learn about Earths interior.
Sent 10: They discovered that Earth has an inner and outer core.
Sent 11: The outer core consists of liquid metals, mainly iron and nickel.
Sent 12: Scientists think that Earths magnetic field is generated here.
Sent 13: It is caused by the motion of this liquid metal.
Sent 14: The liquid metal moves as Earth spins on its axis.
Question: What technology made it possible to test the Earth's magnetic properties? How were scientist able to use this machine to study this phenomenon? (A) Earth has an inner and outer core. The outer core consists of liquid metals, mainly iron and nickel. Scientists think that Earths magnetic field is generated here (B) Tomograph, analized infrared images (C) Seismograph, studied earthquake waves (D) Seismograph, Seismograph are used to study earthquakes.
Sent 9: By studying earthquake waves they were able to learn about Earths interior (E) It was the seismograph that made it possible to learn why the Earth acted like a magnet. Seismograph are used to study earthquakes. By studying earthquake waves they were able to learn about Earths interior.

SOLUTION: C, D, E.

PROBLEM: Paragraph- Sent 1: Renewable Energy Resource Sunlight Sunlight can be used to heat homes.
Sent 2: It can also be used to produce electricity.
Sent 3: This conversion is made possible by solar cells.
Sent 4: However, solar energy may not always be practical.
Sent 5: Some areas are just too cloudy.
Sent 6: Example Solar panels on the roof of this house generate enough electricity to supply a familys needs.
Sent 7: Moving Water Falling water can have a lot of energy.
Sent 8: Its energy can be converted into kinetic energy.
Sent 9: This energy can turn a turbine and generate electricity.
Sent 10: The water may fall naturally over a waterfall or flow through a dam.
Sent 11: A drawback of dams is that they flood land upstream.
Sent 12: They can also reduce water flow downstream.
Sent 13: Either effect may harm ecosystems.
Sent 14: Wind Wind is moving air.
Sent 15: It has kinetic energy that can do work.
Sent 16: Wind turbines change the kinetic energy of the wind to electrical energy.
Sent 17: Only certain areas of the world get enough steady wind.
Sent 18: Many people also think that wind turbines are noisy and not very nice to look at.
Question: What are two different kind of energy discussed in the articles? (A) kinetic energy (B) Solar and kinetic energy (C) It talks about nuclear and wind energy (D) Both solar and water energy are discussed (E) Solar energy (F) This article includes wind and solar energy (G) This article discusses solar and geothermal energy.

SOLUTION:
A, B, D, E, F.