Read the paragraph below and answer the questions that follow. Image 1.

11. Aluminum is _____________ the earth. *
1 point
A. younger than
B. as old as
C. as new as
D. older than
12. Separating aluminum from its compound had always been _________. *
1 point
A. cheap
B. easy
C. hard and costly
D. impossible
13. The main idea of the paragraph is found in_____________. *
1 point
A. sentence 1
B. sentence 2
C. sentence 3
D. sentence 4​