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.

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单项选择题

It can be inferred from the passage that（）

A. scientists have discovered a means by which human memories can be completely eliminated
B. only drugs that affect memory are morally ambiguous
C. ethical debates are a predictable result of certain types of scientific research

单项选择题

If a and b are the lengths of the legs of a right tri-angle whose hypotenuse is 10 and whose area is 20, what is the value of (a+b)2（）

A. 100
B. 120
C. 140
D. 180
E. 200