单项选择题

The truck owners were angry because ______.

A．they failed to get the melons away without being seen
B．they forgot to have their truck checked before they started
C．they had got too many melons on the truck
D．they knew they had a bad reputation

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单项选择题

To do this ( in Paragraph 3 ) means ______.

A．to help patients recover
B．to increase the number of heart surgeries
C．to get back the money spent on the equipment
D．to buy new equipment for the treatment of heart disease

单项选择题

The author would agree that ______.

A．more money should be spent on the prevention of heart disease
B．heart surgery has helped most patients improve their conditions
C．modern technology has made heart surgery more risky than before
D．the public have known a great deal about the causes of heart disease