The predominant gas in the atmosphere of Venus is
A. oxygen.
B. nitrogen.
C. water vapor.
D. carbon dioxide.
E. methane.
Answer: D
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Judge the following sentence according to the criteria given below: Delicate plate corals can live on the deeper outer slope of the reef BECAUSE light intensity is as low as 4% of the surface intensity
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
The United States recently restored diplomatic relations with
A) Jamaica B) Puerto Rico C) Haiti D) Virgin Islands E) Cuba
More than 550 landfills in the United States now use biogas to
A) generate electricity and heat homes. B) produce gasoline and oil products. C) grow vegetables and other commercially raised plants. D) promote the decomposition of the wastes buried in the landfills.
During the third Phase of migration to the U.S. (1870-1920), where did the majority of immigrants come from?
A) England and Africa B) Ireland and Germany C) Southern and Eastern Europe D) Canada and Latin America E) Latin America and Asia