評論
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1.What university are the researchers from?
a) Tokyo University
b) University College, London
c) Massachusetts Institute of Technology
d) Sorbonne, Paris
2.What does the research say about the advice dentists give us?
a) it's great
b) we should listen to it
c) it's all different
d) it's strange
3.How many basic ways to tooth brushing did the research find?
a) 8
b) 7
c) 6
d) 5
4.What kind of movements does the research say we shouldn't do?
a) 45-degree movements
b) circular movements
c) up and down movements
d) in and out movements
5.What kind of toothbrush movement does the research suggest?
a) back-and-forth movements
b) fast and slow movements
c) spiral movements
d) left and right movements
6.What did the lead author say the public needs?
a) information
b) better toothpaste
c) more dentists
d) cheaper dental care
7.What part of the tooth gets damaged if we brush our teeth too often?
a) the back
b) the root
c) the crown
d) the enamel
8.What is the maximum length of tooth-brushing time?
a) 4 minutes
b) 3 minutes and 26 seconds
c) 3 minutes
d) no maximum
9.When does the research say we shouldn't clean our teeth?
a) at midnight
b) after having a filling
c) before lunch
d) after eating
10.What is also on the tongue that needs cleaning?
a) saliva
b) bacteria
c) old toothpaste
d) food
