We can hardly find black flowers because ______. In the text, "it’s a chance in a million." (Line 2, Para. 1) means that ______

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问题 We can hardly find black flowers because ______.
In the text, "it’s a chance in a million." (Line 2, Para. 1) means that ______.

选项 A、it is common
B、it’s extremely unusual
C、it’s lucky
D、it’s impossible

答案B

解析 从字面上理解,十万次有一次机会,表明机会难得;从后文亦可知,黑色花确实罕见。
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