文艺复兴时期人文主义的教育原则和教育方法主要有哪些?
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Section ADirections: In this section, there are 10 incomplete sentences.21. The color of one's skin should be of no barrier _____ success in life.
A. to
B. at
C. in
D. on
22. Advertising is distinguished from other forms of communication _____ the advertiser pays for the message to be delivered.
A. in that
B. in order that
C. in which
D. in the way
23. If either Tom or Betty _____ ,he or she will help me with my questions on English.
A. come
B.came
C. comes
D. has come
24. Our teacher recommends that we _____ as attentive as possible when we visit the museum.
A. are
B. shall be
C. were
D. be