单项选择题
A．what B．one C．it D．who
A．had brought the patient to the brink of death B．did not need to get power from outside the body C．was made of titanium and pump D．was invented by two surgeons from the University of Louisville
A．To explain the greenhouse effect B．To describe the effects of climate change in the UK C．To show how much CO2 is produced by ordinary people’s activities D．To illustrate how industrial activity create the greenhouse effect