6. Lightning is really __________.
A. weapon
B. electricity
C. light
D. mystery
7. People once though that lightning came from __________.
A. scientists
B. ground
C. lightning rod
D. gods
8. One flash of lightning can produce enough electricity for ______ bulbs.
A. 10,000
B. 1,000
C. 1,000,000
D. 100
9. Benjamin Franklin ___________.
A. made the first lightning rod
B. invented electricity
C. built the Empire State Building
D. prevented Lightning from hitting cars
10. _________ is the best place to be during an electrical storm.
A. Swimming pool
B. a high ground
C. Under a tree
D. A car
Passage 3
11. The main topic of this passage is __________.
A. the shortage of fossil fuel
B. the problems that energy researchers face
C. an environmental pollution problem
D. an inexpensive energy source
12. One popular solar heating system makes use of __________.
A. roof collectors and underground storage