下列对疾病条件的叙述哪一项是错误的:
A.条件是左右疾病对机体的影响因素
B.条件是疾病发生必不可少的因素
C.条件是影响疾病发生的各种体内外因素
D.某些条件可以促进疾病的发生
E.某些条件可以延缓疾病的发生
Choose the best answer to complete each of the following statements.Fads are common in the United States because.
Americans are foolish and vain
B. Americans can afford to follow fads
C. Americans want to see changes in their lives
D. Americans are easily influenced by people from other countries
The difference between a fad and a trend is that .
A. a fad lasts longer
B. a fad is more important
C. a trend lasts longer
D. a trend will never change