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问题 选择题

李华的父母惯用左手，李华本人也惯用左手，对此现象可以这样解释（　　）

A．李华的父母将惯用左手的性状传给了她

B．李华和她的父母朝夕相处也形成这样的习惯

C．李华父母将控制惯用左手性状的基因传给了她

D．李华的父母既传给了她惯用左手的性状又传给了她控制该性状的基因

答案

A．李华的父母传给了她的是控制惯用左手基因而不是性状．故该选项的解释错误．

B．李华和她的父母朝夕相处也形成这样的习惯不符合性状的遗传，故该选项的解释错误．

C．李华父母将控制惯用左手性状的基因传给了她．该选项的解释正确．

D．由C选项知“李华的父母既传给了她惯用左手的性状又传给了她控制该性状的基因”的解释错误．

故选：C

单项选择题

新兴产业在不同程度上面临产业发展的障碍。从产业的五种竞争力角度分析，这些障碍不包括（）。

A.原材料、零部件、资金与其他供给的不足

B.顾客的困惑与等待观望

C.被替代产品的反应

D.产业内现有企业的竞争
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单项选择题

In the United States, older people rarely live with their adult children. But in many other cultures children are expected to care (1) their aged parents. In some parts of Italy, the percentage of adult children who (2) with their parents (3) 65 to 70 percent. In Thailand, too, children are expected to take care of their elderly parents; few Thai elderly live (4) . What explains these differences in living arrangements (5) cultures Modernization theory (6) the extended family household to low levels of economic development. In traditional societies, the elderly live with their children in large extended family units for economic reasons. But with modernization, children move to urban areas, leaving old people (7) in (8) rural areas. Yet modernization theory cannot explain why extended family households were never common in the United States or England, or why families in Italy, which is fully modernized, (9) a p tradition of intergenerational living. Clearly, economic development alone cannot explain (10) living arrangements. Another theory associated intergenerational living arrangements with inheritance patterns. In some cultures, the stem family pattern of inheritance (11) . (12) this system, parents live with a married child, usually the oldest son, who then (13) their property when they die. The stem family system was once common in Japan, but changes in inheritance laws, (14) broader social changes brought (15) by industrialization and urbanization, have (16) the (17) .In 1960 about 80 percent of Japanese over 65 lived with their children; by 1990 only 60 percent did-a figure that is still high (18) U.S. standards, but which has been (19) steadily. In Korea, too, traditional living arrangements are (20) : the percentage of aged Koreans who live with a son declined from 77 percent in 1984 to 50 percent just 10 years later. Although most elderly Koreans still expect to live with a son, their adult children do not expect to live with their children when they grow old.

13（）

A.delivers

B.conveys

C.conceives

D.inherits
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