辐射类型包括辐射种类和能量。它们首先取决于源中放射性核素的()。
A. 种类
B. 数量
C. 活度
D. 半衰期
People who feel powerless______.
A. are excessively concerned with circumstances
B. tend to reprove somebody for their deficiencies
C. have neither formal nor informal education at all
D. feel resentful towards their parents and employers
The phrase "this yo-yoing" in the 1st paragraph refers to______.
A. the percentage of Medicare patients in hospitals
B. the huge cost of Medicare for patients in hospitals
C. the better care Medicare patients will benefit from
D. high rates of readmission of patients into hospitals
The author argues that the victim mentality______.
A. helps people elevate to more power in society
B. benefits people with sympathy and attention
C. keeps people from becoming more powerful
D. encourages people to fulfill their prophesy
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