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【简答题】

A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin cancer, actually increases the risk.
Researchers from the University of Iowa based their findings on a review of 18 earlier studies that looked at the association between sunscreen use and melanoma (黑素瘤).They said that they found faults in studies that had reported associations between sunscreen use and higher risk of melanoma.
Most health experts believe that by protecting the skin from the harmful effects of the sun, sunscreen helps pr skin cancer, which is increasing in incidence (发生率) faster than any other cancer in the United States.
But questions has been raised about sunscreen and whether it may has opposite effect, perhaps by allowing people to remain exposed to the sun longer without burning.
The researchers said that among the problems with some earlier studies is that they often failed to take into account that those people most at risk for skin cancer--- people with fair skin and freckles (雀斑), for example--- are more likely to use sunscreen.As a result, it may appear that sunscreen users get cancer more often.
The studies, which generally relied on volunteers to recall their sunscreen use, were also unable to prove how well the products had been applied, said the new study.
小题1:People with fair skin and freckles.A.seldom use sunscreenB.are more in er of skin cancerC.can be free from the harm of the sunD.often expose themselves to the sun小题2:We can learn from the passage that.A.sunscreen users get skin cancer more oftenB.the volunteers have proved the effect of sunscreenC.the new study was based on the experiences of volunteersD.the number of skin cancer patients is increasing in America小题3:Which of the following can be the best title for this passage?A.Sunscreen to Pr Skin CancerB.Sunscreen to Increase Skin CancerC.Skin Cancer Caused by SunscreenD.Skin Cancer Caused by Freckles

题目标签:黑素瘤雀斑素瘤
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参考解析:
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举一反三

【单选题】黑色素瘤是()

A.
一种良性肿瘤
B.
最多见的良性肿瘤之一
C.
一个高度恶性肿瘤
D.
一种最多见的眼睑病变之一
E.
以上均不是

【单选题】恶性黑色素瘤活检适合______

A.
手术治疗
B.
放射治疗
C.
化学治疗
D.
冷冻治疗
E.
加热治疗

【单选题】关于雀斑,下述错误的是

A.
常染色体显性遗传
B.
皮疹表面光滑,不高出皮肤,无自觉症状
C.
日晒后颜色加深,秋冬季变淡
D.
常自5-7岁始见,青春期更明显
E.
多见于女性额部及颊部,对称分布

【单选题】下列葡萄膜恶性黑色素瘤哪一类预后最好()。

A.
上皮细胞型
B.
梭形细胞型
C.
混合细胞型
D.
坏死型
E.
气球状细胞型

【单选题】有关恶性黑色素瘤叙述错误的是()。

A.
多发生在青春期前
B.
多数属于中晚期
C.
C转移途径多为淋巴结转移
D.
多转移到肺、肝等部位

【多选题】胰升糖素瘤的临床三联征包括()

A.
正细胞正色素性贫血
B.
糖尿病
C.
腹泻
D.
表皮坏死剥脱性移行性红斑
E.
舌炎

【单选题】电镜下诊断黑色素瘤的主要依据是()。

A.
张力原纤维、细胞间桥粒
B.
分泌泡、微管腔
C.
神经内分泌颗粒
D.
黑素小体
E.
细肌丝

【单选题】黑色素瘤定性为()

A.
原位癌
B.
良性
C.
恶性
D.
交界性肿瘤
E.
炎症

【多选题】哪些情况应怀疑有胃泌素瘤()

A.
溃疡病手术后复发
B.
溃疡病伴腹泻
C.
多发溃疡
D.
不典型位置溃疡
E.
溃疡病伴高钙血症

【单选题】Rarely do major diseases have a single cause. They are usually the result of a complex interaction between many factors, including genetic, environmental and lifestyle components. Many media reports, ...

A.
people in Wales eat more unhealthy food than people in the US
B.
people in Wales are poorer than people in the US
C.
people in Wales are richer than people in the US
D.
cancers in Wales are caused by more complex factors than those in the US