题目内容：
Prof.White,my respected tutor,frequently reminds me to avail myself（ ）every chance to improve my English.
of
答案解析：
选择题：Prof.White,my respected tutor,frequently reminds me to avail myself（ ）every chan
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People who walk on the grass are liable（ ）a fine of$5.to
People who walk on the grass are liable（ ）a fine of$5.to
Paul strongly denied that he was guilty（ ）cheating innocent customers.for
Paul strongly denied that he was guilty（ ）cheating innocent customers.for
In some cases,different approaches（ ）conflicting theories.the same scientific pr
In some cases,different approaches（ ）conflicting theories.the same scientific problem lead toto
I subscribe（ ）one daily newspaper and one weekly magazine.to
I subscribe（ ）one daily newspaper and one weekly magazine.to
设随机变量X，Y的概率分布相同，X的概率分布为P（X＝0）＝1/3，P（X＝1）＝2/3，且X，Y的相关系数ρXY＝1/2。（Ⅰ）求二维随机变量（X，Y）的联合
设随机变量X，Y的概率分布相同，X的概率分布为P（X＝0）＝1/3，P（X＝1）＝2/3，且X，Y的相关系数ρXY＝1/2。（Ⅰ）求二维随机变量（X，Y）的联合概率分布；（Ⅱ）求概率P（X＋Y≤1）。