Added to gasoline, tetraethyl lead could raise the energy level of "high-________" gasoline without causing premature ignition.
Fill in the blank(s) with the appropriate word(s).
octane
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Who were the supporters of Charles I and Parliament in England's 1642–1646 civil war?
A. the Roundheads and the Cavaliers, respectively B. the Cavaliers and the Roundheads, respectively C. the Puritans and Anglicans, respectively D. the Reds and the Whites, respectively
How did print culture contribute to the Enlightenment and the call for reform throughout Europe?
A. Increasing literacy and the volume of books printed encouraged the discussion of ideas about reform. B. The greater number of print shops employed a large number of people and raised the standard of life for the middle class. C. Governments were able to distribute their ideas in writing to a wider number of people. D. Reference books such as the Encyclopedia were available to most universities.
In 1948, the Soviets began the Berlin Blockade:
a) in response to the outbreak of disease. b) in response to the return of fascism. c) because the United States threatened to invade the Soviet Union. d) in response to the creation of East Germany. e) in response to the creation of West Germany.
To gain Democratic support for the Compromise of 1850, the bills included __________.
a. protection of the domestic slave trade b. protection of the international slave trade c. the popular-sovereignty principle d. a higher tariff