【单选题】According to the passage,as the nineteenth century progressed,the people of the United States_____.
A.
emigrated to other countries
B.
often settled in the West
C.
tended to change the place in which they lived
D.
had a higher rate of birth than ever before
【单选题】模型dN/dt=rN(k-N)/k或N=k/(1+ea-rt)(N为个体数量;t为时间;r为瞬时增长率;K为承载力)反映的是:
【多选题】按推销信息传递方向,推销信息的传递模式可分为( )
【单选题】按照智商的检测标准,高智商的儿童智商必须达到()。
【单选题】模型dN/dt=rN(k-N)/k或 N=k/(1+e a-rt ) ( N 为个体数量; t 为时间; r 为瞬时增长率; K 为承载力 ) 反映的是:
【单选题】眼的屈光状态取决于
B.
屈光面的曲率半径、屈光介质的屈光指数、虹膜的颜色
D.
屈光面的曲率半径、屈光介质的屈光指数、屈光介质间的位置
【单选题】在抗原分子中决定抗原特异性的特殊化学基团称为()
【单选题】By the end of the eighteenth century, the publishers of children’s looks in the United States were most concerned about which of the following?
A.
Attracting children with entertaining stories that provided lessons of correct behavior
B.
Publishing literature consisting of exciting stories that would appeal to both children and adults
C.
Expanding markets for books in both Britain and the United States
D.
Reprinting fictional books from earlier in the century
【单选题】What is the generation with a sudden, large increase in birthrate called in the United States after World War Ⅱ from 1947 to 1961?
【单选题】In the passage the author suggests that the counterculture______
A.
destroyed the United States
B.
changed some American values
C.
was not important in the United States
D.
brought people more leisure time with their families