在使用putchar和getchar函数处理字符时，必须在程序的开头出现包含头文件的

在振动中，振体单位时间内振动的次数叫（）

A．频率

B．周期

C．波长

D．振幅

( )，荷兰殖民者侵占台湾。

A．明中期

B．明中期后

C．明前期

D．明末

在某实验中需考察A、B、C三因素的影响，A、B、C均拟取4水平，由专业知识可得，A、B之间的交互作用不可忽略，应选用_________设计类型

A．系统分组设计或正交设计

B．拉丁方设计或正交设计

C．配伍组设计或拉丁方设计

D．正交设计或析因设计

E．系统分组设计或析因设计

A child who has once been pleased with a tale likes, as a rule, to have it retold in almost the same words, but this should not lead parents to treat printed fairy stories as formal texts. It is always much better to tell a story than read it out of a book, and, if a parent can produce what, in the actual situation of the time and the child, is an improvement on the printed text, so much the better.

A charge made against fairy tales is that they harm the child by frightening him or making him sad thinking. To prove the latter, one would have to show in a controlled experiment that children who have read fairy stories were more often sorry for cruelty than those who had not. As to fears, there are, I think, some cases of children being dangerously terrified by some fairy story. Often, however, this arises from the child having heard the story once. Familiarity with the story by repetition turns the pain of fear into the pleasure of a fear faced and mastered.There are also people who object to fairy stories on the grounds that they are not objectively true, that giants, witches, two-headed dragons, magic carpets, etc. do not exist; and that, instead of being fond of the strange side in fairy tales, the child should be taught to learn the reality by studying history. I find such people, I must say so peculiar that I do not know how to argue with them. If their case were sound, the world should be full of mad men attempting to fly from New York to Philadelphia on a stick or covering a telephone with kisses in the belief that it was their beloved girl-friend. No fairy story ever declared to be a description of the real world and no clever child has ever believed that it was.

The author’s mention of sticks and telephones is meant to suggest that ().

A. fairy stories are still being made up

B. there is some misunderstanding about fairy tales

C. people try to modernize old fairy stories

D. there is more concern for children’s fears nowadays

借款人的（）是个人汽车贷款资金安全的根本保证。

A.还款意愿

B.还款能力

C.抵押品价值

D.担保人资历