单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage. Which of the following may improve the levels of sugar in the blood

A．Spinach.
B．Broccoli.
C．Omega 3.
D．Oats.
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单项选择题
Why won’t the teachers be available to give the oral interviews at the scheduled time
A．They will be attending another meeting.
B．Not all of them will have arrived yet.
C．Some of them will be giving a campus tour.
D．They will be occupied until that point.
单项选择题
What have high homocysteine levels been linked to
A．High blood pressure.
B．Heart attacks and strokes.
C．Diabetes and heart disease.
D．Cancer of colon.
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