问题
选择题
Bill was doing a lot of physical exercise to build up his _______.
A．ability
B．force
C．motivation
D．strength
答案
答案：D
词义辨析。A. 能力；才能 B.武力；力量 C. 动机 D.力气；强度。句意：比尔做了大量体育锻炼在增强他的力气。故选D。
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