【单选题】The large DNA molecules in human chromosomes take more time to replicate than the smaller, circular bacterial chromosomes. If a 1,000- kilobase (kb) fragment of DNA has 10 evenly spaced and symmetric ...
【多选题】Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passa...
A.
Recent discoveries of fossils have helped to show the link between land mammals and cetaceans.
B.
The discovery of Ambulocetus natans provided evidence for a whale that lived both on land and at sea.
C.
The skeleton of Basilosaurus was found in what had been the Tethys Sea, an area rich in fossil evidence.
D.
Pakicetus is the oldest fossil whale yet to be found.
E.
Fossils thought to be transitional forms between walking mammals and swimming whales were found.
F.
Ambulocetus's hind legs were used for propulsion in the water.
【简答题】“Renaissance” means “__ ___”, i.e. Europe rediscovering its origins in the cultures of ancient Greek and Rome. During the Renaissance, the thinkers who worked for and enlightenment were called...