We want to （）how animals use tools.

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

单项选择题–Excuse me, sir. I’m writing a research paper on Chinese culturA.Do you mind a few questions? --_____________B.CertainlyC.No, of course notD.By all meansE.Yes, please

单项选择题Which of the following statements gives the main idea of the second paragraph？（）

A.Credit cards are worse than currency.
B.Currency may not be more of a problem than credit cards.
C.We use credit cards because people steal money.
D.We have many problems with money.

单项选择题Which of the following statements is NOT true？（）

A.There is something easier to use than credit cards.
B.There are no problems with currency.
C.Every person will have a different thumbprint number.
D.There are some problems with the use of credit cards.