at
between
a
The researchers discovered that the mammoths were divided [35]__________ three major groups. One group lived mainly in Asia. [36] __________ group lived mainly in the Americas. And, a third group lived in both places. They believe the [37]_____________ (America) mammoths traveled back across the Bering Strait and in time replaced the other populations of mammoths.
in/into
Another
American
The researchers believe the animals moved the great distances in search of food. A report with their findings [38]________ (publish) in Current Biology. [39]_______ researchers doubted the findings. They say the study is based on only [40]___________ (limit) information.
was published
Other
limited
(78)
What would happen if you fell into a black hole? Your body would be shredded(撕碎) apart into the [31]___________ (small) possible pieces. Neil deGrasse Tyson, director of the Hayden Planetarium at the American Museum of Natural History, [32]_______
wrote the definitive account Death by Black Hole, imagined the experience [33]_______ "the most spectacular(壮观的) way to die [34]_______ space."
smallest
who
as
in
A black hole is a place where the force of gravity is so [35]____________ (power) that you would need to be traveling at a speed faster than the speed of light to escape [36]_______ pull. Since nothing in the universe is faster than the speed of light, nothing [37]_______ falls into a black hole can ever escape. The border at which gravity becomes strong enough [38]_______ (create) that phenomenon is known as the "event horizon";
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