[单项选择]

Historians tend to tell the same joke when they are describing history education in America. It’s the one (51) the teacher standing in the schoolroom door (52) goodbye to students for the summer and calling after them. "By the way, we won World War Ⅱ. "
The problem with the joke, of course, is that it’s not funny. The recent surveys on (53) illiteracy are beginning to numb: nearly one third of American 17-year-olds cannot even (54) which countries the United States fought against in that war. One third have no idea when the Declaration of Independence was (55) . One third thought Columbus reached the New World after 1750. Two thirds cannot correctly (56) the Civil War between 1850 and 1900. Even when they get the answers right, some are just guessing.
Unlike math or science, ignorance of history cannot be (57) connected to loss of international competitiveness. But it does affect o
A. about 
B. in 
C. for 
D. by

[填空题] Historians tend to tell the same joke when they are describing history education in America. It’’s the one (61)______ the teacher standing in the schoolroom door (62)______ goodbye to students for the summer and calling (63)______ them, "By the way, we won World War II." The problem with the joke, of course, is that it’’s (64)______ funny. The recent surveys on (65)______ illiteracy (无知) are beginning to numb (令人震惊): nearly one third of American 17-year-olds cannot even (66)______ which countries the United States (67)______ against in that war. One third have no (68)______ when the Declaration of Independence was (69)______ . One third thought Columbus reached the New World after 1750. Two thirds cannot correctly (70)______ the Civil War between 1850 and 1900. (71)______ when they get the answers right, some are (72)______ guessing. Unlike math or science, ignorance of history cannot be (73)______ connected to loss of international (74)______ But it does affect our futur
A. A．Even
B．Though
C．Thus
D．So