
English: 
So selecting sub-sequences from strings is a very useful thing, we're
going to use it lots of times in many of the programs
we write, so we're going to have one more quiz about this.
This one's going to be a little more abstract, so for this
one, you're given any string S, so S is a variable.
It holds a value of any string, and the question is,
which of these are always equivalent to the string S, no
matter what S was at the beginning? So here are the choices.
We have S index colon. We have S concatenated with S index 0
colon negative 1 plus 1. We have S index 0 colon. We have S
index colon negative 1. And we have
S index colon 3 plus S 3 colon.
So your goal is to check all of the expressions
here that have the same exact value as S, no matter

Japanese: 
文字列の部分列の選択はとても便利です
プログラムを書く時に何度も使います
もう一度部分列の小テストをします
今回のテストは少し抽象的です
今回はどんな文字列sでも使用できます　sは変数です
どんな文字列の値も含むことができます　では問題です
初めの時点でsが何であれ
文字列sと常に等しいのはどれか？
では選択肢です
s［：］でしょうか
それともs＋s［0：－1＋1］でしょうか
あるいはs［0：］
s［：－1］
それともs［：3］＋s［3：］でしょうか
これらの式をすべてチェックし
文字列sが何であれ
sと同じ値を持つ式を全部選んでください

Chinese: 
从字符串中挑选子字符串是非常有用的
我们会在许多编写的程序中多次用到它
因此我们要进行另一个关于挑选子字符串的测验
这个测验将会有一点抽象
对于这个测验 S 是任意字符串 因此 S 是一个变量
它拥有任意字符串的值 问题是
不管 S 在开始时值是多少 以下哪些选项始终等同于字符串 S？
以下是选项
第一个选项是 S[:]
第二个选项是 S+S[0:-1+1]
第三个选项是 S[0:] 第四个选项是 S[:-1]
第五个选项是 S[:3]+S[3:]
你的任务是在这里列出的所有与 S 字符串值相同的选项前面打勾
不管 S 字符串的初始值是多少

Portuguese: 
Selecionar subsequências
de strings é muito útil.
Vamos usar muito nos programas
que escrevermos.
Vamos fazer um teste sobre isso.
Vai ser um pouco mais abstrato.
Dada qualquer string s,
então s é uma variável.
Tem o valor
de qualquer string.
A pergunta é, qual destes
sempre equivalem à string s,
independentemente
do valor inicial de s?
Estas são as opções.
Temos s[:].
Temos s+s[0:-1+1].
Temos s[0:].
Temos s [:-1].
E temos s[:3]
+s[3:].
O objetivo é marcar
todas as expressões
que tenham exatamente
o mesmo valor de s,
independentemente
do valor inicial de s.

English: 
what string S is initially. Feel free to try evaluating
things in the Python Interpreter. Try to think about it without
doing that first. But you're welcome to do experiments running
code in the Python Interpreter to try and answer this. For
remember, for your answer to be correct, it has to work
for any string S, not just the one that you try.

Japanese: 
Pythonインタプリタを使う前に
答えを考えてみてください
Pythonインタプリタでコードを試すのは自由です
正しい答えであるためには
どんな文字列sでも成立しないといけません

Chinese: 
你可以在 Python 解释器上进行评估求值
尝试自己思考 不要一开始就在 Python 解释器上进行试验求值
但是你可以在 Python 解释器上做试验运行代码来尝试解决问题
提示一下 为了确保你的答案准确无误
这个答案需要对任何 S 字符串都有效
而不单单是对你试验的那一个

Portuguese: 
Pode tentar
no interpretador Python.
Mas, antes,
tente pensar sozinho.
Mas pode executar códigos no
interpretador Python para responder.
Para a resposta estar correta, tem
que funcionar com qualquer string s,
não só a que você tentar.
