Red Meat Links to Higher Risk of Breast Cancer¹

    Exercise and keeping a healthy weight are two things that doctors say might help women lower their risk of breast cancer.

    Mothers may reduce their risk if they breastfeed for at least four months. For older women, hormone replacement therapy² can lower the risk of some other diseases. But it has been found to increase the risk of breast cancer. So women should consider their choices carefully. The same may be said for diet.

    New findings show that younger women who eat a lot of red meat have higher rates of breast cancers called hormone-receptor positive³. The growth is fed by the levels of estrogen or another hormone, progesterone, in the body.

    Researchers at Brigham Women’s Hospital in Boston,Massachusetts, reported the findings as part of a health study of nurses. The researchers followed the health of more than 90,000 women from 1991 to 2003. Those who ate the most red meat ate more than one and one-half servings a day. A serving was defined as roughly 84 grams. Those who ate the least red meat ate less than three servings a week. This is what the study found about breast cancers that were hormone receptor-positive: The women who ate the most red meat were almost two times as likely to get them as the women who ate the least of it.

    Eunyoung Cho, the lead author of the report, says more research is needed to know the reason for the link. But in the past, researchers have suggested that three things may play a part. One is the way meat is cooked or processed. Another is the use of growth hormones in cows. And the third is the kind of iron in red meat: The study appears in the Archives of Internal Medicine.

    And now we have more to tell you about our subject — resveratrol. We discussed a study in theUnited Statesthat found that large amounts of this plant compound helped fat mice live longer. The mice were fed much more resveratrol than people could get from red wine, one of the foods that contains it.

    Now, scientists inFrancesay resveratrol also improves muscle performance — again, at least in mice. They were able to run two times as far in laboratory treadmill tests⁴ as mice normally could. The study at theInstituteofGeneticsand Molecular and Cellular Biology⁵ appeared in the journal Cell.

词汇：

breast  /brest/ n. 胸；乳房 

breastfeed /ˈbrestfi:d/ n. 哺乳，喂奶
hormone /"hɔ:məʊn/ n. 激素，荷尔蒙 

therapy / "θerəpɪ/ n. 疗法，治疗
receptor /rɪˈseptə(r) / n. 接收器，感受器；受体 

estrogen / "i:strədʒən/ n. 雌激素
progesterone / prə"dʒestərəʊn/ n. 黄体酮，孕酮（孕激素类药)

serving  /ˈsə:viŋ/ n. 一份饭菜　

process /prə"ses/ n .处理；加工

resveratrol / rez"vɪərɪˌtrɔ:l/ n.白藜芦醇（抗肿瘤药)
compound / "kɒmpaʊnd, kɑmˈpaʊnd/ n.混合物；化合物；复合物 treadmill / ˈtredmɪl/ n .(古时罚囚犯踩踏的）踏车；（喻)单调的工作
genetics / dʒəˈnetɪks/ n. 遗传学

molecular /mə"lekjələ(r) / adj. 分子的
cellular /"seljələ(r) / adj.细胞的 

cell /sel/ n. 细胞

注释：

1.breast cancer：乳腺癌
2.replacement therapy：补充疗法，补偿疗法（应用机体天然产物或合成代用品补充机体的形成或缺陷）
3.hormone-receptor positive：激素受体阳性
4.treadmill test：单调乏味的实验
5. Institute of Genetics and Molecular and Cellular Biology：遗传学、分子生物学及细胞生物学研究所

Estrogen may contribute to the development of breast cancer as much as hormone replacement therapy

A:Right B:Wrong C:Not mentioned

成本效果比（CER）

替代（Replacement）

CE和CEr电量表的接线端子各接多大截面的导线？

下列生物识别设备，哪一项的交差错判率（CER）最高？（）

A:虹膜识别设备 B:手掌识别设备 C:声音识别设备 D:指纹识别设备

There is nothing more possible than a new hip or knee that can put the spring back in your step . Patients receiving joint implants (移植)often are able to resume many of the physical activities they love, even those as vigorous as tennis and hiking. No wonder, then, that joint replacement is growing in popularity.
In the United States in 2007, surgeons performed about 806,000 hip and knee implants(the joints most commonly replaced),double the number performed a decade earlier. Though these procedures have become routine, they are not failure free.
Implants must sometimes be replaced, said Dr. Henrik Malchau, an orthopaedic surgeon (矫形外科医生)at Massachusetts General Hospital in Boston. A study published in 2007 found that 7 percent of hips implanted in Medicare patients had to be replaced within seven and a half years.
The percentage may sound low, but the finding suggests that thousands of hip patients eventually require a second operation, said Dr. Malchau. Those patients must endure additional recoveries, often painful, and increased medical expenses.
The failure rate should be lower, many experts agree. Sweden, for instance, has a failure rate estimated to be a third of that in the United States. Sweden also has a national joint replacement registry, a database of information from which surgeons can learn how and why certain procedures go wrong. A registry also helps surgeons learn quickly whether a specific type of implant is particularly problematic. "Every country that has developed a registry has been able to reduce failure rates significantly, "said Dr. Daniel Berry, chief of orthopedic surgery at the Mayo Clinic in Rochester, Minn.
A newly formed American Joint Replacement Registry will begin gathering data from hospitals in the next 12 to 18 months. It’s good news for those who are considering replacing a knee or hip.

A:A lot of patients need a second operation. B:Doctors are not well trained to ensure successful operations. C:Demands for hip replacement exceed the number of surgeons. D:Replacement operation is becoming too expensive in U. S. hospitals.

There is nothing more possible than a new hip or knee that can put the spring back in your step . Patients receiving joint implants (移植)often are able to resume many of the physical activities they love, even those as vigorous as tennis and hiking. No wonder, then, that joint replacement is growing in popularity.
In the United States in 2007, surgeons performed about 806,000 hip and knee implants(the joints most commonly replaced),double the number performed a decade earlier. Though these procedures have become routine, they are not failure free.
Implants must sometimes be replaced, said Dr. Henrik Malchau, an orthopaedic surgeon (矫形外科医生)at Massachusetts General Hospital in Boston. A study published in 2007 found that 7 percent of hips implanted in Medicare patients had to be replaced within seven and a half years.
The percentage may sound low, but the finding suggests that thousands of hip patients eventually require a second operation, said Dr. Malchau. Those patients must endure additional recoveries, often painful, and increased medical expenses.
The failure rate should be lower, many experts agree. Sweden, for instance, has a failure rate estimated to be a third of that in the United States. Sweden also has a national joint replacement registry, a database of information from which surgeons can learn how and why certain procedures go wrong. A registry also helps surgeons learn quickly whether a specific type of implant is particularly problematic. "Every country that has developed a registry has been able to reduce failure rates significantly, "said Dr. Daniel Berry, chief of orthopedic surgery at the Mayo Clinic in Rochester, Minn.
A newly formed American Joint Replacement Registry will begin gathering data from hospitals in the next 12 to 18 months. It’s good news for those who are considering replacing a knee or hip.

A:strictly controlling the number of replacement operations B:asking hospitals to follow up each case for 12-18 months C:setting up a national joint replacement database D:sending doctors to be trained in Sweden

Most frequently used algorithm for page replacement is

A:LRU B:FIFO C:OPT D:PPT