According to Figure 2, which of the following statements best describes the relative amplitudes of the first p-waves to arrive at the seismograph and the first s-waves to arrive at the seismograph？ The amplitude of the first p-waves to arrive at the seismograph is:
A. smaller than the amplitude of the first s-waves to arrive at the seismograph.
B. larger than the amplitude of the first s-waves to arrive at the seismograph.
C. nonzero, and the same as the amplitude of the first s-waves to arrive at the seismograph.
D. zero, as is the amplitude of the first s-waves to arrive at the seismograph.
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Based on Fact 5 and Student 1’s discussion, which of the 3 stars in the Algol system, if any, was most likely the first to become an MS star？
Algol A
B. Algol B
C. Algol C
D. The 3 stars became MS stars at the same time.
Study 1 differed from Study 2 in which of the following ways？
A. G. fortis finches were captured during Study 1 but not during Study 2.
B. G. fuliginosa finches were captured during Study 1 but not during Study 2.
C. The beak depth of captured birds was measured during Study 1 but not during Study 2.
D. The beak depth of captured birds was measured during Study 2 but not during Study 1.
合理地依据人体一定姿态下的（）骨骼的结构来设计家具，能够调整人的体力损耗，从而极大地提高工作效率。
A. 关节
B. 肌肉
C. 血液
D. 神经
Which of the following variables was kept constant in Study 2 ？
A. Site
B. Monthly rainfall
C. Wet deposition of Zn2+
D. Wet deposition of Cl-
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