题目内容

Rheumatoidarthritisisanautoimmunedisorderthatcausesstiffnessandpaininthe______.

A. connections
B. back
C. head
D. joints

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Patientsshouldconcentrate______improvingcommunicationwithyourdoctor.

A. on
B. in
C. at
D. by

Thelandfillsitecontains_______bagsofmedicalwaste.

A. countable
B. countless
C. counting
D. counted

Hisdoctor______hemayhavestomachulcerbutisnotsure.

A. doubts
B. worries
C. suspects
D. concerns

Therewasa(n)_______ofthreemonthsbetweenthetwoheartattacks.

A. interval
B. range
C. distance
D. extent

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