(C) More than half of all new companies fail within five years.
(D) The management structures of start-up companies are generally less formal than the management structures of ongoing businesses。
(E) Venture capitalists base their decisions to fund start.up companies on such factors as the characteristics of the entrepreneur and quality of strategic planning of the company.
Questions 22-23 are based on the following：
Half of the subjects in an experiment-the experimental group--consumed large quantities of a popular artificial sweetener.Afterward，this group showed lower cognitive abilities than did the other half of the subjects-the control group.who did not consume the sweetener.The detrimental effects were attributed to an amino acid that is one of the sweetener’s principal constituents，
22. Which of the following，if true，would best support the conclusion that some in美国GREdient of the sweetener was responsible for the experimental results?
(A) Most consumers of the sweetener do not consume as much of it as the experimental group members did.
(B) The amino acid referred to in the conclusion is a component of all proteins，some of which must be consumed for adequate nutrition.
(C) The quantity of the sweetener consumed by individuals in the experimental group is considered safe by federal food regulators.
(D) The two groups of subjects were evenly matched with regard to cognitive abilities prior to the experiment.
(E) A second experiment in which subjects consumed large quantities of the sweetener lacked a control group of subjects who were not given the sweetener,
23. Which of the following，if true，would best help explain how the sweetener might produce the observed effect?
(A) The government’s analysis of the artificial sweetener determined that it was sold in relatively pure form.
(B) A high level of the amino acid In the blood inhibits the synthesis of a substance required for normal brain functioning.
(C) Because the sweetener is used primarily as a food additive，adverse reactions to it are rarely noticed by consumers.
(D) The amino acid that is a constituent of the sweetener is also sold separately as a dietary supplement.
(E) Subjects in the experiment did not know whether they were consuming the sweetener or a second，harmless substance。
24. In the arid land along the Colorado River, use of the river’s water supply is strictly controlled：farms along the river each have a limited allocation that they are allowed to use for irrigation.But the trees that grow in narrow strips along the river’s banks also use its water.Clearly, therefore，if farmers were to remove those trees，more water would be available for crop irrigation.
Which of the following，if true，most seriously weakens the argument?
(A) The trees along the river’s banks shelter it from the sun and wind，thereby 美国GREatly reducing the amount of water lost through evaporation.英语作文
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