The proper title for the text should be ______.
A. Sex Ratio Seen to Vary by Latitude
B. Climate factors Affecting Sex Ratio
C. Statistics about Human Populations
D. Variations in Socioeconomic Status
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According to the text, the removal of duty would lead to______.
A. the collapse of human civilization
B. the creation of a strong work ethic
C. the fulfillment of one"s commitment
D. an immense improvement of society
党的十八大对国际国内形势的总体判断是：当前，世情、国情、党情继续发生深刻变化，我们面临的()。
A. 发展机遇和风险挑战前所未有
B. 机遇前所未有，挑战也前所未有，机遇大于挑战
C. 机遇前所未有，挑战也前所未有，挑战大于机遇
D. 世界多极化和经济全球化的趋势在曲折中发展，科技进步日新月异，综合国力竞争日趋激烈
If one wants to better understand regret, he should first know something about______.
A. three emotional flavors
B. its working mechanism
C. its typical symptoms
D. its three categories
It isnt always beneficial to look back over our lives since we may______.
A. fail to find any meaning in our lives
B. feel unsatisfied with the things we did
C. feel regretful about what we did in the past
D. become less courageous to live in the future
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