Look at the four squaresthat indicate where the following sentence could be added to the passage. Use of the converter requires people to switch to lead-free petrol. Where would the sentence best fit？
A. Square Ａ.
B. Square Ｂ.
C. Square Ｃ.
D. Square Ｄ.
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通过与学生的谈话、讨论，可使他们对与运动学习成就动机有关的自我行为产生______。
What were "steady sellers" (line 23) ？
A. Printers whose incomes were quite large
B. People who traveled from town to towa selling Books and pamphlets
C. Investors who provided reliable financial Support for new printers
D. Publications whose sales were usually consistent from year to year
The word trivial in Paragraph 4 is closest in meaning to ______.
A. slight
B. important
C. abundant
D. significant
体育教学中，教师采用“在成绩单上给某个同学画小红旗”的形式进行的反馈，属于______。
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