1.Contrary to popular belief, colds are not caused by exposure to severe weather.

2.The custom can be traced back to the roman era.

3.A more common belief is tips were first given in the 18th century England.

4.In America and Europe it is customary to tip anywhere from 10% to 20%.

5.Today most people decide the size of tip according to the quality of the service.

答案：

1.和人們的普遍想法相反，感冒并非惡劣的氣候造成。

2.付小費這種習(xí)俗這種風(fēng)俗可以追溯到古羅馬時代。

3.付小費這種習(xí)俗源于18世紀(jì)的英國。

4.在美國和歐洲，人們普遍的做法是以消費金額的百分之十到百分之二十來付小費的。

5.現(xiàn)在，人們付小費的數(shù)量取決于享受的服務(wù)質(zhì)量。