33. Which strategy is not used in the essay to clarify the issue and support the argument?
(A) examples
(B) comparison and contrast
(C) classification
(D) cause and effect

29. Why does the author exclude Alaska from his calculations?(A) to prove that no area in America will become too overpopulated even if its population increases elevenfold(B) to limit his discussion to areas economically important to America(C) to show he is talking about an extreme case(D) to exclude the weather factor

30. What does "niche" probably mean in the context?(A) of a religious denomination(B) of a special kind(C) of a small size(D) of some significance

31. Which of the following statements, if true, can be used to counter the author's argument?(A) The population density in China is 145 people per square kilometer.(B) The median household income in Illinois is 56,210 while that in the countryside area of Illinois is 58,141.(C) Beijing and Pyongyang had signed an agreement to grant 40,000 industrial trainee visas to North Koreans to permit them to work in China.(D) The GDP per capita of a country with a population density higher than 350 people per square kilometer is usually lower than that with a density lower than 350 people.

32. What is the topic of the passage?(A) Security(B) Choices(C) Freedom(D) Polarities

34. Which of the following arguments counters the argument made in this passage?(A) The more choices we have, the more freedom.(B) The more freedom we have, the less security.(C) The less freedom we have, the less choices.(D) The more security we have, the more freedom.

35. Which of the following examples best supports the argument presented in the passage?(A) If we provide more tenure positions for university teachers, they will have more space to decide for themselves which research area they want to focus on.(B) If we sign a trade treaty that helps open up a free market, we will be less able to keep inflation below two percent.(C) If we establish laws to regulate the right and obligation in marriage, we will have less freedom to build the kind of marriage relationships we want.(D) If a company doesn't set up some SOP and check whether the employees follow them, it is more likely to lose its competitiveness.

1. (5%) Which of the following is the possible integrating factor for y' -y =x4?(A) e-2(B) x-2(C) ln(x-2)(D) e2x-2(E) e-2x

2. (5%) Find the inverse Laplace transform of the function F(s) =.(A) cos3x + sin3x(B) cosh3x + sinh3x(C) e3x cos2x + e3xsin2x(D) e3x cosh2x + e3xsinh2x(E) e3x + e-3x

3. (5%) Which are the possible solutions of the differential equation y" - 4y'+ 4y = et?(A) y = et(B) y = e2t(C) y = et + e2t(D) y = tet + e2t(E) y = et + te2t

4. (5%) The mass-spring system is described by x" +bx' + 4x = 0, x(0)=4, x'(0)= 0.Under which condition, the system is in the state of underdamped motion?(A)b＞4(B)0＜b＜4(C)b = 4(D)b = 2(E)None of above