[单项选择] Given a valid DateFormat object named df，and 16.Date d = new Date（0L）； 17.String ds = "December 15， 2004"； 18.//insert code here What updates d’s value with the date represented by ds？（）
A. 18. d = df.parse（ds）；
B. 18. d = df.getDate（ds）；
C. 18. try {19. d = df.parse（ds）；20. } catch（ParseException e） { }；
D. 18. try {19. d = df.getDate（ds）；20. } catch（ParseException e） { }；

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[单项选择]Scientists estimate that about 530,000 other objects, too small to detect with radar, ______ the Earth too.
A. being circled
B. are circling
C. are to be circling
D. are being circled

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[单项选择] 1.public class GC{ 2.private Objec to； 3.private void doSomethingElse（Object obj）{o=obj；} 4.public void doSomething（）{ 5.Object o=new Object（）； 6.doSomethingElse（o）； 7.o=new Object（）； 8.doSomethingElse（null）； 9.o=null； 10.} 11.} When the doSomething method is called，after which line does the Object created in line 5 become available for garbage collection？（）
A. Line5
B. Line6
C. Line7
D. Line8
E. Line9
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[单项选择] 11.public static void main（String[]args）{ 12.Object obj=new int[]{1，2，3}； 13.int[] someArray=（int[]）obj； 14.for（inti：someArray）System.out.print（i+""） 15.} What is the result？（）
A. 123
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D. Compilation fails because of an error in line 14.
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