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阅读下面短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中，选出最佳选项。
One day,an expert in time management was speaking to a group of students．To drive his 1 home,he used an illustration（演示）that students will never 2
“Okay,now watch carefully”,and then he pulled out a wide— mouth jar and set it on the 3 in front of him．He also 4 about a dozen fist-sized rocks and carefully 5 them,one at a time,into the jar．
When the jar was filled to the 6 and no more rocks would 7 inside,he asked,“Is this jar full?”Everyone in the class answered,“Yes．”
The expert replied,“Really?”He 8 under the table and pulled out a bucket of small stones．He dropped some 9 and then asked the group once more,“Is the jar full?”
By this time the class wason to him．“ 10 ”one of them answered carfully．
“Good．”he replied,and then brought out a bucket of sand．He started dumping(droping)the sand in the jar and it 11 into all of the 12 left between the rocks and the small stones． 13 he asked the question,“Is this jar full?”“No!”the class shouted．
“Good．”Then he looked at the class and asked,“What is the point of this illustration?”
One 14 student raised his hand and said,“The point is,no matter how 15 your schedule（时间表）is,if you 16 really hard you can always fit some more things in it!”
“ 17 ”the speaker replied．“That's not the point．The 18 this illustration teaches us is;If you don't put the big rocks in first,you'll never get them in 19 ．”
What are the‘big rocks’in your 20 ?Then,put those in your jar first．
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