The new evening dress__ her as much as 400 dollars（）
A. paid
B. took
C. spent
D. cost
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People have__ their diets a lot over the past few years（）
A. changed
B. consisted
C. led
D. advised
The chair looks rather hard but actually it is very comfortable to sit__（）
A. at
B. on
C. over
D. under
依据（）,我们可以把个案研究分成诊断性的个案研究、指导性的个案研究和探索性的个案研究
A. 研究的对象
B. 研究的目的
C. 研究数目的多寡
D. 研究的性质
根据基尔霍夫电流定律，多个理想电流源串联的条件是（）
A. 电压相等
B. 电流相等
C. 极性一致
D. 极性相反
E. 方向一致
F. 方向相反G．电位相等H．阻抗相等
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