问题 解答题

下表是青春期各项发育指标出现的顺序.阅读下表,回答有关问题.

年龄(岁)女孩男孩
8~9身高突增开始
10~11 * * 发育开始,身高突增高峰,出现阴毛身高突增开始,睾丸、阴茎开始增长
12 * * 继续增大身高突增高峰,出现喉结
13月经初潮出现,出现腋毛出现阴毛,睾丸、阴茎继续增大
14 * * 显著增大变声,出现腋毛
15脂肪积累增多,丰满,臀部变圆一般首次遗精,出现胡须
16月经规则阴茎、睾丸已达成人大小
17~18骨骺愈合,停止生长体毛接近成人水平
19以后骨骺愈合,停止生长
(1)请对照上表,根据自己的发育情况,看自己的发育是否正常.如果不正常,试找出原因.

(2)针对现在部分同学青春期发育提前的现象,试通过查找资料,请教家长、老师或医生,分析其中原因.

答案

(1)结合上表中的内容、分析发现,自身发育基本正常.

(2)分析发现,部分同学有青春期发育提前的现象,究其原因,主要有:1、生活水平提高,饮食中营养过剩,孩子的生长发育加速,性发育及性成熟有提前的趋势.2、摄取含有性激素的滋补品或误服避孕药.3、食品中含激素类的添加剂太多,促进了身体的发育,使青春期提前.4、环境污染.农药及塑料业制造厂等排放的有害物质及其分解物质,产生了一 系列的环境类激素污染物,这些污染物导致早熟等.

故答案为:(1)正常

(2)1、饮食中营养过剩.2、摄取含有性激素的滋补品或误服避孕药.3、食品中含激素类的添加剂太多.4、环境污染.

单项选择题
单项选择题

The domestic economy in the United States expanded in a remarkably vigorous and steady fashion. The revival in consumer confidence was reflected in the higher proportion of incomes spent for goods and services and the marked increase in consumer willingness to take on installment debt. A parallel strengthening in business psychology was manifested in a stepped-up rate of plant and equipment spending and a gradual pickup in expenses for inventory. Confidence in the economy was also reflected in the strength of the stock market and in the stability of the bond market. For the year as a whole, consumer and business sentiment benefited from the ease in East-West tensions.

The bases of the business expansion were to be found mainly in the stimulative monetary and fiscal policies that had been pursued. Moreover, the restoration of sounder liquidity positions and tighter management control of production efficiency had also helped lay the groundwork for a p expansion. In addition, the economic policy moves made by the President had served to renew optimism on the business outlook while boosting hopes that inflation would be brought under more effective control. Finally, of course, the economy was able to grow as vigorously as it did because sufficient leeway existed in terms of idle men and machines.

The United States balance of payments deficit declined sharply. Nevertheless, by any other test, the deficit remained very large, and there was actually a substantial deterioration in our trade account to a sizable deficit, almost two-thirds of which was with Japan. While the overall trade performance proved disappointing, there are still good reasons for expecting the delayed impact of devaluation to produce in time a significant strengthening in our trade picture. Given the size of the Japanese component of our trade deficit, however, the outcome will depend importantly on the extent of the corrective measures undertaken by Japan. Also important will be our own efforts in the United States to fashion internal policies consistent with an improvement in our external balance.

The underlying task of public policy for the year ahead--and indeed for the longer run-- remained a familiar one.- to strike the right balance between encouraging healthy economic growth and avoiding inflationary pressures. With the economy showing sustained and vigorous growth, and with the currency crisis highlighting the need to improve our competitive posture internationally, the emphasis seemed to be shifting to the problem of inflation. The Phase Three program of wage and price restraint can contribute to reducing inflation. Unless productivity growth is unexpectedly large, however, the expansion of real output must eventually begin to slow down to the economy’s larger run growth potential if generalized demand pressures on prices are to be avoided.

The author mentions increased installment debt in the first paragraph in order to show()

A. the continuing expansion of the economy

B. the growth of consumer purchasing power

C.the consumers’ confidence in the economy

D.the soaring consumer incomes for spending