| We all have offensive breath at one
time of another. In most cases, offensive breath emanates from bacteria in the
mouth, although there are other more surprising causes. Until a few years ago, what the most doctors could do was to counsel patients with bad breath about oral cleanliness. Now they are finding new ways to treat the usually curable condition. Bad breath can happen whenever the normal flow of saliva slows. Our mouths are full of bacteria feeding on protein in bits of food and shed tissue. The bacteria emit evil-smelling gases, the worst of which is hydrogen sulfide. Mouth bacteria thrive in airless conditions. Oxygen-rich saliva keeps their numbers down. When we sleep, for example, the saliva stream slows, and sulfide-producing bacteria gain the upper hand, producing classic "morning breath". Alcohol, hunger, l A. thrive on B. account for C. originate from D. descend from [单项选择]George: ______
Ann: Well, it's a great dance all right, but I've been to quite a few parties lately and fed up with them. [单项选择]Activity duration estimate inputs include all of the following EXCEPT （）.
A. resource requirements B. projeet document updates C. activity lists D. constraints [单项选择]The official languages of New Zealand include all the following EXCEPT______.
A. English B. Māori C. NZ Sign Language D. French [单项选择]Inputs to determine budget include all of the following EXCEPT （）.
A. cost baseline B. cost estimate C. work breakdown structure D. project schedule [单项选择]Responses to risk threats include all of the following except （）.
A. avoidance B. acceptance C. mitigation D. rejection [单项选择]Inputs to quality control include all of the following EXCEPT （）.
A. work performance information B. quality management plan C. quality checklists D. PERT chart [单项选择]The great change of the city astonished all the visitors．
A. surprised B. scared C. excited D. moved [单项选择]All of the Great Lakes are shared between the United States and Canada EXCEPT
A. Lake Ontario. B. Lake Superior. B. Lake Michigan. C. Lake Erie. [单项选择]With great efforts of the peace-loving people all over the world, Iraq（）the war.
A. survived from B. survived in C. survived D. survived to 我来回答: 提交
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