单项选择题

Hydrogen is the fundamental element of the universe () it provides the building blocks from which the other elements are produced.

A. so that
B. but that
C. in that
D. provided that

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What most probably is Mary()

A. Nurse.
B. Student.
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D. Teacher
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According to the conversation, what is the woman suffering from()

A. Toothache.
B. Stomachache.
C. Headache.
D. Backache.
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