阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。
Learning a life lesson on managing time
One day，an expert was speaking to a group of students about how to manage their time．He ________ an example those students will never forget．
He pulled out a wide jar and put it on the table．He also ________ about a dozen rocks and carefully ________ them into the jar．One at a time．When no more rocks would ________ inside，he asked，“Is this jar full？”
Everyone in the class answered loudly，“Yes．” The expert said，“Really？” He ________ under the table and pulled out a bucket of gravel (砾石)．He put some gravel in and ________ the jar，causing it to go down into the ________ between the big rocks．He then asked the group once more，“Is this jar full？”
“ ________ not，” one of them answered this time．“Good！” he replied．From under the table he brought out a bucket of sand and started ________ the sand in the jar and it went into all of the spaces left ________ the rocks and the gravel．Once more he asked the question，“Is this jar full？”
“No！” the class shouted．Once again he said，“Good．” Then he ________ a cup of water in ________ the jar was full．Then he looked at the class and asked，“What is the ________ here？”
Immediately one ________ student raised his hand and said，“The point is，no matter how full your ________ is，if you try really hard you can always fit ________ things in！” “No，” the expert replied，“that’s not the point．The point is if you don’t put the big rocks in ________ ，you’ll never get them in ________．What are the ‘big rocks’ in your ________ ？Time with your loved ones，your education，or your dreams？Remember to put these big rocks in first or you’ll never get them in at all，________ you’ll never have the real quality time you need to spend on the big，important things．”
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