[填空题]In the 21st century, those people with old ideas will __________ (落后于是代).

[填空题]In the 21st century, those people with old ideas will __________ (落后于是代).

[填空题]In the last century old people didn’t have so many problems because they had their own clubs.

[填空题]In tact, many new ideas just renew old ones through______.

[填空题]In the 16th century people developed great passion for plant collecting out of religious reasons as well as ______.

[填空题]By the end of the 19th century people had shown enormous enthusiasm for ______.

[单项选择]Before the mid-nineteenth century, people in the United States ate most foods only in season. Drying, smoking, and salting could preserve meat for a short time, but the availability of fresh meat, like that of fresh milk, was very limited, there was no way to prevent spoilage, But in 1810 a French inventor named Nicolas Appert developed the cooking-and-sealing process of canning. And in the 1850’s an American named Gail Borden developed a means of condensing and preserving milk.
Canned goods and condensed milk became more common during the 1860’s, but supplies remained low because cans had to be made by hand. By 1880, however, inventors had fashioned stamping and soldering machines that mass-produced cans from tinplate. Suddenly all kinds of food could be preserved and bought at all times of the year.
Other trends and inventions had also helped make it possible for Americans to vary their daily diet. Growing urban populations created demand that encouraged fruit and ve
A. Causes of food spoilage
B. Commercial production of ice
C. Inventions that led to changes in the American diet
D. Population movement in the nineteenth century

[单项选择]In 18th century, sending kidnapped African people to certain death was not considered a crime because they were "goods" , to do with as the owner______.
A. felt free
B. saw fit
C. took pick
D. set forth