11．聽下面一段獨白，回答第12至第15四個小題．現(xiàn)在你有20秒鐘的時間閱讀這四個小題．聽完獨白后，你有20秒鐘的時間來選擇有關(guān)選項．獨白連讀兩遍．
12．What don't we need to do the experiment？
13．Before placing the coin on the top of the bottle，what should we do？
A．Place them in order．
B．Place them in the warm water．
C．Place them in the cold water．
14．When we hold the bottle for some seconds，what will happen？
A．The coin will jump by itself．
B．The coin will fall off the top of the bottle．
C．The coin is still there．
15．According to the experiment，what can we do if we want the coin to fall？
A．Put the bottle in the warm water．
B．Move your hands away from the bottle．
C．Place the coin on the top of the bottle．
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