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龋病病因的四联因素理论有细菌、食物、____和时间。

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要提倡口腔卫生“三三制”，即____。

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Drinking Water
Drinking water that looks clean may still contain bugs (虫子), which can cause illness. A small company called Genera Technologies has produced a testing method in three stages, which shows whether water is safe. The new test shows if water needs chemicals added to it, to destroy anything harmful. It was invented by scientist Dr. Adrian Patton, who started Genera five years ago. He and his employees have developed the test together with a British water company.
Andy Headland, Genera&39;s marketing director, recently presented the test at a conference in the USA and forecasted good American sales for it. Genera has already sold 11 of its tests at $42,500 a time in the UK and has a further four on order. It expects to sell another 25 tests before the end of March. The company says it is the only test in the UK to be approved by the government.
Genera was formed five years ago and until October last year had only five employees; it now employs 14. Mr. Headland believes that the company should make around $19 million by the end of the year in the UK alone.
Genera Technologies has developed a method that determines whether water is clean. 查看材料

A. Right
B. Wrong
C. Not mentioned

口腔中能感受到酸甜苦辣咸等味觉的是____。

造成错颌畸形的主要原因有遗传因素、后天因素以及____。