单项选择题

During the World Youth Contest，the contestants all put on their national（）。

A.clothes
B.costumes
C.clothing
D.dresses

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Which situation can lead to fluid losing? ()

A. nausea
B. vomiting
C. diarrhea
D. dizziness
此题为多项选择题。

AIDS is also spreading widely among illegal blood donors.()

此题为判断题(对，错)。