What does the author's attitude toward recycling solid waste？
A. Objection.
B. Detachment.
C. Approval.
D. Optimism.
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According to the passage, "sink or swim"(Sentence 2, Paragraph 2)is______.
A. absolutely wrong.
B. partly right.
C. a good idea.
D. a proven method.
不计人工资总额的是()。
A. 计时工资
B. 计件工资
C. 津贴补贴
D. 独生子女补贴
钢筋混凝土梁宽200mm，高400mm，受拉区配有3根25的钢筋，已知梁的单侧保护层厚度为25mm，则配制混凝土时选用卵石的粒径不得大于()mm。
A. 28
B. 31
C. 47
D. 63
Paragraph 4 is used in this passage to
A. illustrate the relationship between left-handers and violence.
B. indicate muses for high criminal rate in traditional society.
C. compare murder rates in different tribal regions.
D. prove left-handers' inclination to commit crimes.
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