It can be inferred from the text that animal emotions ______ .
A. originate from natural evolution
B. remain uncertain until we are sure
C. develop faster in social encounters
D. are as rich and deep as human emotions
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Some people maintain a scientific skepticism because they______.
A. fail to realize what uncertainty really means to science
B. are uncertain about whether animals have emotions
C. prefer to put off whatever they do in science
D. ignore the nature of scientific research
According to a new study. ______.
A. sex ratio is determined by where people live
B. sex ratio at birth is skewed all over the world
C. the skewed sex ratio is a natural phenomenon
D. the percentage of boys born varies with latitude
According to the text. Congress
A. gives workers a chance for a fair hearing in federal court
B. grants Americans the right to sue for age-discrimination
C. vindicates the legal rights of Americans in federal court
D. waives the right of Americans to sue for discrimination
马来酸氯苯那敏抗过敏作用的机理是()
A. 激动H1受体
B. 阻断H1受体
C. 激动H2受体
D. 阻断H2受体
E. 激动H1受体
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