A principal economic function to transfer funds from those who have（）to invest to those who need funds to invest in（）.

单项选择题An asset is a possession that has value in an exchange and can be classified as().

A.financial or intangible
B.financial or variable
C.tangible or intangible
D.fixed or variable

单项选择题Now the pollution caused by the increasing number of cars more and more serious in many citiesA.becomeB.becameC.is becomingD.had become

单项选择题We want to （）how animals use tools.

A.survey
B.investigate
C.research
D.inquiry

单项选择题The evidence was（）. We were convinced it was true.

A.irresistible
B.compelling
C.powerful
D.absorbing

单项选择题Those examples are not enough，you should give （）examples to make your argument convincing.

A.some
B.any
C.some more
D.any more