buoi 17 PI

1. Jena is a mathematical genius. She's very young, but she can do difficult math problems

• a. Jena has difficulty in school.

• b. Jena is extremely intelligent.

• c. Jena is an average student

2. Mary is an astronomer. She spends many nights looking at the sky.

• a. Mary is a kind of scientist.

•     b. Mary is a kind of writer.

• c. Mary is a kind of traveler

3. 3. Martin stopped living in 2010. He ................ in 2010. ( 4 letters)

4. There are millions of stars in the sky at night! The sun is the closest star to Earth.

•     a. A star is the same thing as a planet.

•     b. A star is a large ball of burning gas a long way from us

5. Brightness changes for different stars. Some give off a lot of light, but others are difficult to see from Earth.

•     a. Brightness is how much light something gives off.

•     b. Brightness is how big something is.

6. The distance between the cities of Dallas and Fort Worth is very small. You can drive from downtown Dallas to downtown Fort Worth in about 30 minutes.

•     a. Dallas is far from Fort Worth.

•     b. Dallas is near Fort Worth.

7. Benjamin Franklin discovered important facts about electricity. He showed that lightning is electricity.

•  a. He read about electricity and understood the facts.

•     b. He found new information about electricity.

8. The universe is really big! It contains planets, stars, and moons.

•     a. The universe is Earth, our moon, and the sun.

•     b. The universe is everything that exists