coming
into
As
is estimated
That is about the same as two and a half times [35]__________ the Earth. But blood goes the [36]_____________ (distant) in about twenty seconds on its way back to the heart. Each day the heart pumps about eight thousand liters of blood.
The blood feeds the brain and [37]_______ organs with oxygen and nutrients. [38]_______ also carries away carbon dioxide and other waste.
around
other
distance
It
The heart pumps by expanding and contracting of muscle. In a healthy adult, the heart beats [39]_______ average of seventy-two times a minute -- about one hundred thousand times a day.
A healthy adult heart is about the size of two fists and looks like a piece of red meat. [40]______________ in overweight people, it can look yellow because of fat.
an
But/While
(77)
Until recently, many scientists believed that mammoths(猛犸象) came from Europe and Asia because that is [31]__________ the oldest fossils(化石) were found. Earlier studies of the mammoths involved only one continent [32]_______ a time. The researchers discovered that mammals traveled back and forth(来回地) several times [33]___________ Eurasia and Alaska over thousands of years. The animals were able to travel on [34]_______ land bridge that connected Siberia and Alaska during low sea levels. where
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