单项选择题

According to the text, the fundamental cause of the ice ages is ______.

A．periodic changes in the earth's orbit around the sun
B．fossil remains of one-celled animals
C．alternating cold and warm seasons
D．changes in distance of the earth from the sun
<上一题 目录 下一题>
热门 试题

单项选择题
Targeting children for advertising is controversial because children ______.
A．can't understand the information provided in the advertisements
B．often give off information that may be dangerous to them
C．are unable to give consent since they are too young
D．are not ready to evaluate advertisements in terms of accuracy
单项选择题
One reason that children are unable to resist giving personal information on the Intemet is ______.
A．it is presented in connection with entertainment
B．they do not know that the information is going to be read by someone
C．they feel they must follow an adult's orders
D．due to their inability to distinguish an advertisement from a non-advertisement
相关试题