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【单选题】
哺乳动物是生物界最高等的一类动物，哺乳动物的主要特征有（ ）A.
体表被，体温恒定，胎生哺乳，用肺呼吸
B.
体表被覆羽毛，体温恒定，卵生
C.
体表有细鳞或甲，体温不恒定
D.
用鳃呼吸，用鳍游泳，体表被覆鳞片
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【简答题】请翻译: Frictional unemployment
【单选题】Frictional unemployment arises when
A.
unskilled or low-skilled workers find it difficult to obtain desirable,
B.
ng-term jobs.
C.
labor must be reallocated from industries that are shrinking to areas that are growing.
D.
workers must search for suitable jobs and firms must search for suitable workers.
E.
output and employment are below full-employment levels.
【简答题】Frictional resistance
【单选题】The unemployment due to economic recession should be considered as ______.
A.
frictional unemployment.
B.
structural unemployment.
C.
cyclical unemployment.
D.
seasonal unemployment.
【简答题】β受体阻断剂在临床上用于治疗 , , 。
【单选题】Which of the following most likely would decrease frictional unemployment?
A.
an increase in the number of high school and college graduates
B.
effective Internet-based employment services and job registries
C.
an expansion of unemployment compensation benefits
D.
All of the above would decrease frictional unemployment.
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