The author asserts that the correlation of sex ratio and latitude is ______.
A. affected by variations in socioeconomic status
B. invulnerable to abortion or killing of baby girls
C. vulnerable to sex selection by parents before birth
D. to be verified with evidence of more years of data
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The author feels nervous when making big decisions because he______.
A. is born indecisive and irresolute
B. dislikes making definite decisions
C. lacks enough intelligence to do so
D. attempts to avoid the ensuing regrets
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
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
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