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足月新生儿骨骼X线检查，哪个部位的骨化中心尚未出现，有助于甲状腺功能减低的诊断

A．头状骨
B．舟状骨
C．掌骨和指骨
D．股骨远端和胫骨近端
E．桡骨远端和尺骨远端

答案

参考答案：D

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在观察鸡蛋结构的实验中，按要求将卵壳膜剪破，把其中的内容物倒到培养皿内，你能看到：

(1)有许多透明的凝胶状物质，这是_________，它能为胚胎发育提供所需_________。

(2)有一个黄 * * 状的凝胶状物质，这是_______，其内贮存有供胚胎发育用的____________。

(3)在黄 * * 状的凝胶物体上，有一个白色小点，这是________，是由________分裂形成的。

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Less education, income linked to obesity in women, not men


Women who are better educated and live in households that are middle-income or above are less likely to be obese than women who are less educated and live in the lowest income households, new government research shows.
Among men, there is not a statistically significant (26) in obesity based on income and very (27) difference based on education, the data show.
(28) , about one in three U.S. adults-almost 73 million people-are obese, which is (29) 30 or more pounds over a (30) weight. Extra weight raises the (31) of diabetes, heart disease, some types of cancer and other (32) .
"There is a relationship between obesity and income, but it’s not a (33) story," says Cynthia Ogden, an epidemiologist with the National Center for Health Statistics, part of the Centers for Disease Control and Prevention.
"When looking at these two (34) of socioeconomic status-income and education-their (35) is greater on women than men," she says.
Jennifer Lovejoy, president of the Obesity Society, says that (36) -income women may be more likely to become obese because of environmental (37) such as lack of access to safe places to do physical activity and easy access to fast food.
Among the findings:
·29% of women who live in households with an annual income of $77,000 or more for a family of four are obese in opposition (38) 42% of women who live in households with an annual income below $29,000 for a family of four.
·23% of women with a college degree are obese, significantly less than the 42% of women with (39) than a high school education.
·33% of men who live in households with an annual income of $77,000 or more for a family of four are obese, (40) 29% of men who live in households with an annual income below $29,000 for a family of four are obese. This difference is not considered statistically (41) .
The analysis is based on (42) from the National Health and Nutrition Examination Survey, which is considered the gold (43) for evaluating obesity because it is a(an) (44) survey of people whose weight and height are actually (45) rather than being self-reported.

A. Therefore B. However C. Overall D. Whereas
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