Workers receive a substantial part of their pay in the form of（bonuses） .
A. 退休金
B. 奖金
C. 保证金
D. 保险
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His knowledge （spans） many different areas.
A. 增加
B. 减少
C. 跨越
D. 计算
Research （revealed） that age makes no difference.
A. 写作
B. 揭露
C. 计算
D. 解决
He was satisfied with his （earnings） as an accountant.
A. 游戏
B. 小说
C. 收入
D. 玩具
Opinion polls are an unreliable（predictor） of election outcomes.
A. 数字
B. 预测指标
C. 利率
D. 利息
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