1.

Directions: Each of the following items in this section has a sentence with a missing preposition. Select the correct preposition from the given options and mark your response accordingly.Simulations of the 20th century by climate models that exclude the observed increase _______ greenhouse gases fail to simulate the increase in temperature over the second half of the 20th century.

A. of
B. in
C. by
D. to
Answer» C. by


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