抑郁发作的核心症状是下面中的哪一项()?
A.意志活动减退
B.躯体不适
C.思维迟缓
D.情感低落、意志活动减退、思维迟钝
E.情感低落、兴趣减退及快感丧失
参考答案:E
—When did the computer crash?
—This morning,while I ________ the reading materials downloaded from some websites.(2012·福建)
A.have sorted
B.was sorting
C.am sorting
D.had sorted
288÷36,试商时把36看作40来试商,商会偏( ),把36看作30来试商,商就会偏( ),把36看作( )试商正好。