一副扑克牌去掉大、小王后还剩52张牌中一张一张有放回地取4张，则恰有 3张是黑桃的概率为（）
一副扑克牌去掉大、小王后还剩52张牌中一张一张有放回地取4张，则恰有 3张是黑桃的概率为（）B
去掉
物体受力作用而发生变形，当外力去掉后又能恢复原来形状和尺寸的性质称为（ ）
物体受力作用而发生变形，当外力去掉后又能恢复原来形状和尺寸的性质称为（ ）A
把字符串"abcdef"右边的空格去掉应使用（ ）函数。
把字符串"abcdef"右边的空格去掉应使用（ ）函数。B
把字符串"abcdef"右边的空格去掉应使用（ ）函数。
把字符串"abcdef"右边的空格去掉应使用（ ）函数。B
物体受力作用而发生变形，当外力去掉后又能恢复原来形状和尺寸的性质称为（ ）
物体受力作用而发生变形，当外力去掉后又能恢复原来形状和尺寸的性质称为（ ）A
It was in this room _____ they had a meeting yesterday.
It was in this room \_\_\_\__ they had a meeting yesterday.
This out-of-date teaching method _____.
This out-of-date teaching method \_\_\_\__.
It is ten years _____ Miss Green returned to Canada.
It is ten years \_\_\_\__ Miss Green returned to Canada.
Little Tom is an orphan(孤儿). _____, he has to make a living by himself.
Little Tom is an orphan(孤儿). \_\_\_\__, he has to make a living by himself.