42. Which of the following is closest in meaning to controls in the second paragraph?
(A) Subjects used for making comparisons.
(B) Control panels for playing baseball games.
(C) Abilities for demonstrating non-athletic skills.
(D) Baseball players knowing little about eye-tracking.
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統計: A(40), B(11), C(22), D(3), E(0) #2704222
統計: A(40), B(11), C(22), D(3), E(0) #2704222