15．Here is an experiment （实验） to see how ants can organize some clever teamwork．
What's going on？
You can see one of the best examples of insect teamwork by watching ants．If one ant finds food，it leads others there to eat it too．They follow each other by making long trails．The ants go back and forth collecting food，to take back to their nest （穴）．When you move the fruit，the ants will still find it．But，instead of making a new direct route （路线） to the food，they will follow each other through their old trail route．
32．What will happen if one ant finds food？C
A．The ant will eat all the food．
B．The ant will watch other ants．
C．The ant will lead others to the food．
D．The ant will wait until others come．
33．If the fruit is moved to a new position，the ants willD．
A．rail to find it
B．give up looking for it
C．make a new direct route to it
D．get to it through the old trail route
34．Which is the correct order to do this experiment？B
a．Move the fruit to a new position．
b．Find an ant．
c．Check the fruit an hour later．
d．Put a thin slice of fruit in front of the ant．
A．a-b-c-d B．b-d-c-a C．d-b-c-a D．c-a-d-b
35．What can we learn from this experiment？D
A．The experiment is done successfully in the lab．
B．Ants do the experiment to show their team spirit．
C．Careful watching does little help in this experiment．
D．We can find out some facts by doing small experiments．
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