13．
选文的语言体现了说明文的特色，请举出一例，并加以说明。(3分)
13．
在太阳内部，氢原子核在超高温下发生________，释放出巨大的核能；核电站利用的是核反应堆内的铀核发生________时所释放的核能来发电的。（填“聚变”或“裂变”）
下列物质的鉴别方法正确的是
It is boring．（同义句转换）
12．
14． Don-t do any other things while you are doing your homework． So please_________
My father’s birthday is on May the ______ (two)．
22． In a recent survey at one school，scientists found many students liked_________
12．
27．In the morning， Ruth usually has a bath．
In the end，they haven’t got anything at all．（改为同义句）
14．
请从下面两个文题中，任选其一，按要求作文。