下列各项中应划分为持有至到期投资核算的是（）。A.从二级市场购入某企业面值100万元的债券，并准

One may assume from this article that pigs ______.

A．have remained unchanged for centuries

B．are naturally vicious animals

C．make a significant contribution to modem life

D．are better than any other animal for laboratory

30 percent in the last five years. In the average household budget, the proportion spent on car purchases has remained unchanged in that period. Therefore the average household budget must have increased by 30 percent over the last five years. Which of the following is an assumption on which the argument relies？

A．The average number of factory-new cars purchased per household has remained unchanged over the last five years.

B．The average amount spent per car by businesses buying factory-new cars has risen 30 percent in the last five years.

C．The proportion of the average household budget spent on all car-related expenses has remained unchanged over the last five years.

D．The proportion of the average household budget spent on food and housing has remained unchanged over the last five years.

E．The total amount spent nationwide on factory-new cars has increased by 30 percent over the last five years.

One may assume from this article that

A．pigs have remained unchanged for centuries

B．pigs are naturally vicious animals

C．pigs make a significant contribution to modem life

D．pigs are better than any other animal for laboratory

uctuated, reaching a peak in the middle of the period.

What remained unchanged in spite of all the challenges in family life？

A．The concept of "the family" as a social unit.

B．The attitudes to birth control.

C．The attitudes to religion.

D．The ideas of authority and tradition.

Which of the following statements is true according to the passage？

A．The number of females having higher education in rich countries is larger than that in developing countries.

B．The number of women with doctor degrees is smaller than that of men.

C．The illiteracy rate of world population has remained unchanged for the past two decades.

D．In emerging countries, girls have almost equal access to elementary and secondary education as boys.

The number of 16-to-25-year-olds in the population

A．has increased.

B．has dropped.

C．has remained steady.

A、提高 increase

B、降低 decrease

C、不变 remained unchanged

D、N/A

A、an increasing number of free electrons

B、a decreasing number of free electrons

C、lower conduction levels

D、relatively unchanged conduction conduction levels