[单项选择]The toys most boys play with are different from those that girls play with because ______.

[单项选择]The toys most boys play with are different from those that girls play with because ______.

[单项选择]The reason why the toys most boys play with are different from those that girls play with is that ______.

[单项选择]

Most boys, and many girls too, have at some time or other started a stamp collection. Stamp-collecting, or, to call it (21) its correct name, philately, (22) an increasing popular hobby from as (23) as 1854 -- for less than two decades (十年) after postage stamps (24) . Today the hobby numbers (25) are not only boys and girls, but also men and women from all ranks (阶层) in society. So rapidly (26) the interest in stamp-collecting increase in the United States of America (27) in 1921 the United States Post Office found itself (28) set up a special department to (29) the needs of collectors. At present the yearly (30) of this department total over three hundred thousand dollars.

21（）
A. that
B. so that
C. where
D. when

[单项选择]The problem is that most local authorities lack the ______ to deal sensibly in this market.
A. anticipation
B. perception
C. prospect
D. expertise

[单项选择]The very biggest and most murderous wars during the industrial age were intra-industrial-wars that ______ Second Wave nations like Germany and Britain against one another.
A. pitted
B. drove
C. kept
D. embarked