咳嗽时腰椎间盘突出症的腰腿痛会()。
A.加重
B.减轻
C.无变化
D.消失
E.明显减轻
参考答案:A
Read and write the opposite words.写出划线单词意思相反的词。
1. The elephant is heavy. The cat is .
2. English is easy. Maths is .
3. We won the game. They .
4. Bob throws the ball and David it.
5. The bus goes slowly. The car goes .
(本小题满分12分)
从装有2只红球,2只白球和1只黑球的袋中逐一取球,已知每只球被抽取的可能性相同。
(1)若抽取后又放回,抽3次,分别求恰2次为红球的概率及抽全三种颜 * * 的概率;
(2)若抽取后不放回,求抽完红球所需次数不少于4次的概率。