问题
单项选择题
有一个八位二进制数的补码是11111101，其相应的十进制数是
A．509
B．-2
C．-3
D．253
答案
参考答案：C
解析： 因为该数的最高位为 1，所以其对应的十进制数一定是负数。首先取得对应的原码为10000010，按照二十进制数的转换规则得到结果为(3。
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有一个八位二进制数的补码是11111101，其相应的十进制数是
A．509
B．-2
C．-3
D．253
参考答案：C
解析： 因为该数的最高位为 1，所以其对应的十进制数一定是负数。首先取得对应的原码为10000010，按照二十进制数的转换规则得到结果为(3。
For Senior 3 students, choosing which college to attend can be the most exciting and thrilling time in their entire school lives. This is also true for an American girl 26 Melanie. Melanie’s dad, James Porter, who is the chief of police for a Chicago suburb, wants Melanie to 27 nearby Northwestern University, where she’s 28 been accepted. But Melanie, 17, really wants to go to Georgetown University in Washington, D.C, where she’s been wait-listed. When she gets an unexpected 29 from Georgetown University, she decides to 30 a road trip with a few 31 female friends. Melanie believes it is her first step 32 adulthood. But 33 the fact that this trip is “girls only”, James isn’t 34 with the prospect(期望) of his little princess 35 the world without him. He wants to protect her, so he joins the girls and hopes he can convince Melanie to go to Northwestern. 36 Melanie’s father only has the best of 37 , his presence 38 an endless series of comic encounters（遭遇）. After following their faulty device 39 into the backwoods (偏远地区), James and Melanie 40 Melanie’s little brother and his pet pig have been hiding in the spare compartment (隔间). What should be a simple tyre change 41 the expensive car rolling down a mountain, forcing them to hike to a nearby hotel…. All these disasters add spice(额外的趣味) to their trip while along the way a father and a daughter 42 get the chance to really 43 each other. All parents, 44 they have college students or not, can relate to the bittersweet realization that their kids are growing up. 45 what Melanie and James have done, we all can find the delicate (脆弱的) balance between staying connected and letting go.
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