[单项选择]The voluntary decision to label seems to have been {{U}}rewarded{{/U}}.
A. paid out
B. paid back
C. paid up
D. paid off

[单项选择]

There seems never to have been a civilization without toys, but when and how they developed is unknown.They probably came about just to give children something to do.
In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world.
What is remarkable about the history of toys is not so much how they changed over the centuries but how much they have remained the same. The changes have been mostly in terms of craftsmanship, mechanics, and technology. It is the universality of toys with regard to their development in all parts of the world and their persistence to the present that is amazing. In Egypt, the Americas, China, Japan and amon
A. their social roles are rigidly determined
B. most boys would like to follow their fathers' professions
C. boys like to play with their fathers while girls with their mothers
D. they like challenging activities

[单项选择]The book seems to have been ______ from various books and articles.
A. pieced together
B. taken off
C. broken away
D. pulled out

[单项选择]The book seems to have been ________ from various books and articles.
A. pieced together
B. taken off
C. broken away
D. pulled out

[单项选择]What products have been damaged


A. Wheat, corn, meat and sugar.
B. Wheat, maize, cotton and meat.
C. Wheat, cotton, meat and bean.
D. Wheat, sugar, meat and bean.

[单项选择]Manyscientists have been probing psychologicalproblems.
A. solving
B. exploring
C. settling
D. handling

[单项选择]Conditions everywhere have been seriously worsened, ______ the postwar rise in prices.
A. as to
B. in relation to
C. owing to
D. with regard to

[单项选择]A: Have you heard that all flights have been cancelled because of the weather B: ______.

[单项选择]How many uncertified teachers have been fired


A. 750.
B. 950.
C. 370.
D. 290.

[单项选择]Many scientists have been probing psychological problems.
A. solving
B. exploring
C. settling
D. handling

[单项选择]International efforts against Serbia have been ineffective because ______.