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• 1.托福听力荟萃 43
• In our lab today, we'll be testing the ______ that babied can count as early as five months of age. The six babies here are all less than six months o...
• 2.托福听力荟萃 42
• If you liked the colorful animals we just saw, you're going to love these next animals. Frogs. You might not normally think of frogs as being colorful...
• 3.托福听力荟萃 41
• Now we're entering Kangaroo Country. In all, there are more than fifty different species of kangaroo, and the advantage of zoos like ours is that you ...
• 4.托福听力荟萃 40
• Today I want to talk to you about _______ and their nests. You'll recall that biologists divide species of wasps into two groups: _______ and social. ...
• 5.托福听力荟萃 39
• OK. In the last class we talked about the _______ of trees, and we ended up with a basic description of angiosperms. You remember that those are plant...
• 6.托福听力荟萃 38
• This room is ______ to electric fish. The eel in the tank behind me can produce a strong ______ of electricity to stun its prey, but most of the fish ...
• 7.托福听力荟萃 37
• Before I tell you about the interesting ______ related to Tyrannosaurus rex, I need to review something we studied last semester --- the difference be...
• 8.托福听力荟萃 36
• To us, the environment in which fish dwell often seems cold, dark, and ______. But there are advantages to living in water, and they have played an im...
• 9.托福听力荟萃 35
• Word comes from California of a new weapon in the war on _______ pests. Two scientists working for a firm in Anaheim, California, have developed a met...
• 10.托福听力荟萃 34
• The winds of a tornado are the most violent and ______ ones on Earth. Any of you who have seen one knows very well how frightening and powerful they a...