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【多选题】
互补品是指使用价值上必须相互补充才能满足人们某种需要的商品，以下属于互补品的有( )。 A，汽车与汽油A.
家用电器与电
B.
石油和煤炭
C.
煤气和电力
D.
羽毛球和羽毛球拍
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举一反三
【单选题】Which of the following is NOT true about most studies of the genetic diversity of human population in Europe?
A.
They are well-designed with scientific approaches.
B.
They put much emphasis on large-scale variation.
C.
Their findings are not academically signifi c ant.
D.
Their focus is on the prehistoric diversities.
【单选题】Which of the following is a key distinction (关键区别) between observational studies and well-designed experiments?
A.
Observational studies are more costly to conduct than experiments
B.
Less subjects are available for observational studies than experiments
C.
Ethical ( 伦理 ) constrains prevent large-scale observational studies
D.
An experiment can show a direct cause and effect relationship, whereas an observational study cannot.
【单选题】Large-scale studies are needed to ___the encouraging results we have obtained so far.
A.
conduct
B.
confirm
C.
contract
D.
commit
【单选题】Large-scale studies are needed to________the encouraging results we have obtained so far.
A.
conduct
B.
contract
C.
confirm
D.
commit
【单选题】Large-scale studies are needed to ______ the encouraging results we have obtained so far.
A.
confirm
B.
conduct
C.
commit
D.
contract
【单选题】large-scale studies are needed to _____the encouraging results we have obtained so far.
A.
conduct
B.
confirm
C.
contract
D.
commit
【单选题】VI Reading Comprehension Read the passage and then choose the BEST answer to each question. 1. The genetic diversity of human populations in Europe has been the subject of intense scrutiny since the f...
A.
The Genetic Diversity of Populations in Europe
B.
North African Invasion of the Iberian Peninsula
C.
The Religious Impact of Jews in the Iberian Peninsula
D.
Religious and Demographic Development in the Iberian Peninsula
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