C．Snowball cannot dance to the versions of the song Everybody.

　　D．it is the brain and the nervous system that control the mental abilities.

　　60．The idea of studying animals’ ability to keep the beat comes from________.

　　A．bird lovers’ discovery

　　B．humans’ musical sense

　　C．the same abilities in children

　　D．videos of dancing birds

　　第二节(共5 小题；每小题2分，满分10分)

　　61.

　　Population growth is determined by the relationship between births and deaths.The growth rate is calculated by the birth rate minus the death rate.If the birth rate is 4%，for example，and the death rate is 3%，the population growing at rate of 1% per year.

　　62.

　　Historically，families had many children，but average life expectancies are low and many children died young.Improvements in nutrition and public health programs in the past 30 years have led to a drop in the mortality rate and hence to more rapid population growth.

　　63.

　　Public health programs and improved nutrition over the past 30 years have brought about declines in mortality rates in the developing nations.But fertility rates(出生率)have not declined as quickly，and the result has been high rates of population growth.Reduced population growth depends to some extent on decreased birth rates.

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