单项选择题

A．He’ll give a hand after class.
B．He has to do something else.
C．He isn’t afraid to go with the woman.
D．He’s going to hand in his paper.
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单项选择题
The invasive diarrhea and the non-invasive diarrhea are different in that（）

A．the former attacks the intestine walls but the latter does not
B．the former causes dehydration but the latter does not
C．the former makes the patient physically weaker than the latter
D．the former is more dangerous than the latter
单项选择题
According to Paragraph 2 （）

A．people of higher status are less likely to be stricken with diarrhea
B．diarrhea is no longer a serious disease in the modem world
C．diarrhea has been a threat to humanity throughout history
D．the elderly are more likely attacked by diarrhea than the young
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