A: keptoff
B: brokendown
C: putback
D: heldup
举一反三
- Wewere______forhalfanhourinthetrafficandsowearrivedlate. A: keptup B: heldup C: cutup D: broughtup
- Ifsomethingismodern,itis A: up-to-date B: brokendown C: strong
- Whileworkingonthefarm,thestudents________agoodknowledgeofplantlife A: heldup B: pickedup C: turnedaway D: putdown
- Wewere about to start _________ it beganto rain.
- Wewere about to start _________ it beganto rain. A: as B: when C: before D: while
内容
- 0
【单选题】Wewere caught in _____ sudden rainstorm, which made our trip in the valley _____unbelievable adventure. A. a; 不填 B. 不填; an C. a; an D. 不填; 不填
- 1
<spanstyle="text-decoration:underline;">Although</span>wehadexpectedpoorserviceattheresort,<spanstyle="text-decoration:underline;">wewere</span>morethan<spanstyle="text-decoration:underline;">satisfied</span>atthattention<spanstyle="text-decoration:underline;">wereceived</span><br/>ABCD<br/>throughoutourstay.<spanstyle="text-decoration:underline;">Noerror</span><br/>E
- 2
20A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、120、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、130、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、140、A、B、C、D、A
- 3
以下集合A={a,b,c,d}上关系,其中( )是等价关系。 A: {(a,a),(a,d),(b,b),(b,c),(c,b),(c,c),(d,a) } B: {(a,a),(a,b),(b,a),(b,b),(c,c),(c,d),(d,c),(d,d)} C: {(a,a),(b,b),(b,c),(c,b),(c,c),(d,a),(d,d)} D: {(a,a),(a,b),(b,a),(b,b),(b,c),(c,b),(c,c),(d,d)}
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设A={a,b,c,{a,c}},B={a,c,d},则B-A=____,A⊕B=____。 A: {a,c,d}, {{a,c},b,d} B: {d}, {a,c,b,d} C: {d}, {{a,c},b,d} D: {d}, {a,c}