星期天，淘气、笑笑和机灵狗一起去爬山．她们从A地上山，越过山顶下山到B地用了3.

B

　A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin cancer, actually increases the risk.

　Research 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 flaws 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 prevent skin cancer, which is increasing in incidence (发生率) faster than any other cancer in the United States.

　But questions have been raised about sunscreen and whether it may have the opposite effect 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---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.

60．The underlined word “flaws” in the 2nd paragraph most probably means _________.

A．evidences         B．facts         C．faults         D．failures

61．People with fair skin and freckles ________.

A．seldom use sunscreen　　　　　　         B．are more in danger of skin cancer

C．can be free from the harm of the sun　　     D．often expose themselves to the sun

62．We can learn from the passage that _________.

A．sunscreen users get skin cancer more often

B．the volunteers have proved the effect of the sunscreen

C．the new study has based on the experiences of volunteers

D．the number of skin cancer patients is increasing in America

63．Which of the following is the best title of the passage?

A．Sunscreen to Prevent Skin Cancer　      B．Sunscreen to Increase Skin Cancer

C．Skin Cancer Caused by Sunscreen　      D．Skin Cancer Caused by Freckles

下列哪项不是影响定量调查的因素

A．主办者身份 

B．问卷形式和长度 

C．资料评价方法 

D．问卷难易度 

E．资料收集方法

用于治疗干眼症、夜盲症、皮肤干燥等的是

A．维生素D3
B．维生素B6
C．维生素B2
D．维生素C
E．维生素A1

读“我国部分省区土地及草地退化状况比较图”，判断下列叙述正确的是（）

A.甘肃沙漠化占土地总面积比例最大

B.内蒙古水土流失的面积与宁夏一样多

C.西北各省区沙漠化的自然原因主要是干旱

D.云南、贵州两省水土流失严重的人为原因主要是过度放牧

"In the long run," as John Maynard Keynes observed, "we are all dead. " True. But can the (1) run be elongated in a way that makes the long run (2) And if so, how, and at what cost People have dreamt of (3) since time immemorial. They have sought it since the first alchemist put an elixir of (4) on the same shopping list as a way to turn lead into gold. They have (5) about it in fiction, from Rider Haggard’s "She" to Frank Herbert’s "Dune". And now, with the growth of (6) knowledge that has marked the past few decades, a few researchers believe it might be within (7) .

To think about the question, it is important to understand why organisms-people (8) -age in the first place. People are like machines: they (9) That much is obvious. However, a machine can always be (10) A good mechanic with a stock of spare parts can keep it going (11) . Eventually, no part of the (12) may remain, but it still carries on, like Lincoln’s famous axe that had three new handles and two new blade.

The question, of course, is whether the machine is worth (13) . It is here that people and nature (14) . Or, to put it slightly (15) , two bits of nature disagree with each other. From the individual’s point of view, (16) is an imperative. You cannot reproduce unless you are alive. A fear of death is a sensible evolved response and, since (17) is a sure way of dying, it is no surprise that people want to stop it in its tracks. Moreover, even the appearance of ageing can be (18) . It (19) the range of potential sexual partners who find you attractive-since it is a sign that you are not going to be (20) all that long to help bring up baby-and thus, again, curbs your reproduction.

14（）

A.compromise

B.agree

C.disagree

D.consent