In the study, Karagas and her colleagues interviewed 603 basal cell skin cancer patients and 293 with squamous cell skin cancer．They talked to 540 control subjects。．who did not have either type of skin cancer.
About l million Americans are diagnosed annually with skin cancer．Among those skin cancer patients，about 80 percent are with basal cell skin cancer,16 percent，with squamous cell skin cancer and 4 percent。with melanoma．the most serious form of skin cancers．Back to the interviewed patients，190 reported that they had used tanning devices at some time．In the control groups，only 75 had used such devices．Karagas said a statistical analysis shows that those who used tanning equipment were 2.5 times more likely to get squamous cell skin cancer than those who had not used the devices．For basal cell cancer．the risk was 1.5 times greater．
The risk was highest for those who first used the tanning devices before the age of 20，said Karagas．For this group，the squamous cell cancer risk was 3.6 times greater than that of the controls while the basal cell cancer risk was 1.3 times greater．
1.The passage confirms that using tanning equipment is harmful to one’s health．
A．Right B．Wrong C．Not mentioned
2.The highest rate of skin cancers is found in teenagers who use sun lamps frequently．
A．Right B．Wrong C．Not mentioned
3.Melanoma is a more serious cancer than lung cancer．
A．Right B．Wrong C．Not mentioned
4.Karagas reported her research results basing on interviews with a group of skin cancer patients and a control group of people with no skin cancers．
A．Right B．Wrong C．Not mentioned
5.Doctor James Spencer’s argument implies that in the long run，getting all infrequent sunburn is worse than the small．day-to-day exposure．
A．Right B．Wrong C．Not mentioned
About l million Americans are diagnosed annually with skin cancer．Among those skin cancer patients，about 80 percent are with basal cell skin cancer,16 percent，with squamous cell skin cancer and 4 percent。with melanoma．the most serious form of skin cancers．Back to the interviewed patients，190 reported that they had used tanning devices at some time．In the control groups，only 75 had used such devices．Karagas said a statistical analysis shows that those who used tanning equipment were 2.5 times more likely to get squamous cell skin cancer than those who had not used the devices．For basal cell cancer．the risk was 1.5 times greater．
The risk was highest for those who first used the tanning devices before the age of 20，said Karagas．For this group，the squamous cell cancer risk was 3.6 times greater than that of the controls while the basal cell cancer risk was 1.3 times greater．
1.The passage confirms that using tanning equipment is harmful to one’s health．
A．Right B．Wrong C．Not mentioned
2.The highest rate of skin cancers is found in teenagers who use sun lamps frequently．
A．Right B．Wrong C．Not mentioned
3.Melanoma is a more serious cancer than lung cancer．
A．Right B．Wrong C．Not mentioned
4.Karagas reported her research results basing on interviews with a group of skin cancer patients and a control group of people with no skin cancers．
A．Right B．Wrong C．Not mentioned
5.Doctor James Spencer’s argument implies that in the long run，getting all infrequent sunburn is worse than the small．day-to-day exposure．
A．Right B．Wrong C．Not mentioned