选择单词的正确形式：I _______ （live）in the dormitory.
A. lives
B. live
C. living
选择单词的正确形式：Tim_______ (walk) his dog every morning.
A. walking
B. walk
C. walks
Each of the following statements concerning spirochetes is correct EXCEPT
A. Species of Borrelia are part of the normal flora of the mouth
B. The species of Leptospira that cause leptospirosis grow primarily in humans and are usually transmitted by human-to human contact
C. Species of Borrelia cause a tick-borne disease called relapsing fever
D. Species of Treponema cause syphilis and yaws
From a public health perspective, in which of the following stages of syphilis can a person be considered not infectious?
A. Primary
B. Secondary
C. Tertiary
D. Reactivated latent
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