单项选择题

A bag contains 3 red, 4 white, and 5 blue marbles. Jason begins removing marbles from the bag at random, one at a time. What is the least number of marbles he must remove to be sure that he has at least one of each color.（）

A. 3
B. 6
C. 8
D. 10
E. 12

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单项选择题

Each of the following is a valid conclusion from the graphs and the fact that the population of the United States was greater in 1995 than in 1991 EXCEPT（）

A. In 1991, adults whose highest degree was at least a bachelor’s degree were more than twice as likely to participate in adult educa-tion than those whose highest educational attainment was a high school diploma or GED (high school equivalency diploma..
B. On a percentage basis, from 1991 to 1995, the greatest increase in the adult education par-ticipation rate was among those adults whose highest educational attainment was grades 9-12, without earning a high school diploma.
C. In 1995, more people participated in adult edu-cation programs than in 1991.
D. From 1991 to !995 the rate of participation in adult education among the groups represented in the graphs increased the least for those who had attained at least a bachelor’s degree.
E. In 1995, more adults with at least a bachelor’s degree participated in adult education than did adults who attended some college but did not earn a college degree.

单项选择题

The Homestead Act of 1862 has been called one of the most important pieces of legislation in the history of the United States. Signed into law by Abraham Lincoln, this Act turned over vast amounts of the public domain to private citizens. 270 million acres, or 10% of the area of the United States was claimed and settled under this act. The Act provided that any head of a family who was a citizen, or declared his intention of becoming a citizen, could claim 160 acres of land. The claimants needed to pay a small registration fee and reside on the land for five years. Claimants were also required to build a home and grow crops on the land. If after five years, the original settler were still on the land, it would become his property, free and clear.Which of the following, if true, would most undermine the validity of the author's statements about the significance of the Homestead Act （）

A. Most settlers had moved on from their claim sites before the end of five years.
B. Most settlers chose to grow non-food crops.
C. Some congressmen thought there should be no registration fee for settlers.
D. Some non-citizen claimants were unable to become citizens.
E. Some of the land was unsuited to growing wheat. Questions refer to the following graph.