题干
The former Olympic champion was ________ in the quarterfinals last night when he lost 0-2 at home.
A：knocked off
B：knocked out
C：knocked dow
D：knocked over
答案(点此获取答案解析）
B
张卡片上分别写有数字
，从这
张，则取的两张卡片上的数字之和为奇数的概率为（ ）