变量 tstr = ‘dk3029’, 表达式 eval(tstr[2:-1]) 的结果是：
A. 302
B. 3029
C. dk3029
D. dk302
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下面代码的执行结果是 a = "ABC" b = a a = "XYZ" print(b)
ABC
B. XYZ
C. 出错
D. b
下面代码的执行结果是 >>> x = "Happy Birthday to you!" >>> x * 3
A. 系统报错
B. 'Happy Birthday to you!Happy Birthday to you!Happy Birthday to you!'
C. Happy Birthday to you! *3
D. Happy Birthday to you!
下面代码的输出结果是 a = 5/3+5//3 print(a)
A. 2.666666666666667
B. 3.333333
C. 5.4
D. 14
以下程序的输出结果是 a = 30 b = 1 if a >=10: （缩进）a = 20 elif a>=20: （缩进）a = 30 elif a>=30: （缩进）b = a else: （缩进）b = 0 print('a={}, b={}'.format(a,b))
A. a=20, b=1
B. a=30, b=1
C. a=30, b=30
D. a=20, b=20
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