【单选题】
You remember things every day, but_________ do you do it?
【单选题】
Various_________ are offered in adult educational institutions.
【单选题】
When you send a letter or a postcard, you have to put_________ on th envelope or on the card.
【判断题】
<img src=http://p.ananas.chaoxing.com/star3/origin/44ee0085c9af58bc60f06911bcbd9b31.png/>
【判断题】
<img src=http://p.ananas.chaoxing.com/star3/origin/6274fb53f064640c3d7be359685699ec.png/>
【判断题】
<img src=http://p.ananas.chaoxing.com/star3/origin/f41eca56a588dcf0f061fc307c2b4d8e.png/>
【判断题】
若线性方程组AX=B中方程的个数等于未知量的个数,则AX=B有唯一解。
【单选题】
设<img class=jc-formula data-tex=P(A)=p,P(B)=q,P(A\cup B)=r src=https://huaweicloudobs.ahjxjy.cn/181E43153EA4CC8D9DFCC275A4A92148.png style=vertical-align: middle;/>,则<img class=jc-formula data-tex=P(A\bar { B } ) src=https://huaweicloudobs.ahjxjy.cn/57ED91E022204B8EB91CBA7582EAAA9A.png style=vertical-align: middle;/>=( )A. p-q-r; B.p+q-r; C.r-q; D.1-p-q+r.