【简答题】British government wants UK to acquire coronavirus "herd immunity." According to over 200 scientists and medical experts, however, going for “herd immunity” at this point does not seem a viable option...
【简答题】At one time, the animals present in these fossil beds were assigned to various modern animal groups, but most paleontologists now agree that all Tommotian fossils represent unique body forms that aros...
【简答题】Listen again and correct the eight errors in this summary of the interview. Natural gas is far less environmentally friendly than other fossil fuels like oil and coal, but it is also being replaced by...
【单选题】An even more exciting find was reported in 1994, also from Pakistan. The now extinct whale Ambulocetus natans ("the walking whale that swam") lived in the Tethys Sea 49 million years ago. It lived aro...
A.
Fossil legs of early whales are a rare find.
B.
The legs provided important information about the evolution of cetaceans.
C.
The discovery allowed scientists to reconstruct a complete skeleton of the whale.
D.
Until that time, only the front legs of early whales had been discovered.