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【单选题】
厂商多雇佣一个工人的价值等于A.
劳动的边际产量乘以产品价格
B.
边际成本
C.
边际收益
D.
劳动的边际产量
E.
劳动的边际产量乘以工资
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【单选题】What is the limitation of the rubidium method?
A.
Rubidium is everywhere in the rock.
B.
Strontium atoms are hard to detect at the normal temperature.
C.
It cannot date sediments.
D.
It is time-consuming.
【简答题】［A］ scarce ［B］ little ［C］ rare ［D］ poor
【单选题】Water is considered a scarce good because:
A.
. scarce goods are less expensive.
B.
. not enough of it is available for all needs.
C.
. not enough of it is available for all needs and because it is less expensive.
D.
. it does not have any uses.
【单选题】As a result of the birth of Dolly and an adult ewe,______.
A.
American scientists were strongly criticized for human cloning
B.
government-funded researches were banned from controversial topics
C.
American universities started to conduct similar research overseas
D.
the IVF industry is starting to disappear in the U. S.
【单选题】It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).
A.
shall be
B.
be
C.
are to be
D.
must be
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