6. What can most reasonably be inferred about the Safe Water Drinking Act from the passage?
A. It specified the nature and percentage of the components of solder.
B. It may have impacted what elements a company chose to use in making solder.
C. It promoted tin over lead for all applications.
D. It prompted shifts in the manufacture and distribution of canned goods.
7. The author indicates that the demand for tin in part exists because
A. tin can be found in nature.
B. tin of nearly 100% purity can be produced.
C. tin is the best conductor of electricity.
D. of tin's impact on an individual's health.
8. Which choice provides the best evidence for the answer to the previous question?
A. Lines 1-2 ("Tin is…cassiterite")
B. Lines 38-40 ("Electrolytic…tin")
C. Lines 42-44 ("Solder…connection")
D. Lines 58-61 ("Because tin…storage")
9. As used in line 66, "opaque" most nearly means
A. dark.
B. wide.
C. impenetrable
D. dense.
10. The sentence in lines 79-81 ("Companies changed…business") primarily serves to
A. indicate a continuation of an existing chain.
B. describe the many uses for a product.
C. show the sole difficulty in answering a question.
D. support an earlier statement through an example.