题目

. Some couples spend every waking minute together. Others fill their hours with personal hobbies,outside interests and even part-time jobs, just to keep their distance from each other! There should beprivate time and couple time, suggests Dr. Stephen Treat at Jefferson Medical College in Philadelphia.You don't want your latter years to turn into a process where two people unite as one. If you hold tootightly to your partner, it's going to cause resentment and anger. If you're completely separate, you'llboth be lonely and disconnected. You need balance. So you have to talk about how vou'll achi 有一种称为“摇头丸”的毒品已从国外流入我国某些城市，服用后会使人出现食欲减退、血压升高、飘飘然的幻觉等症状，对人体有很大伤害，必须予以缉查和打击，已知这种毒品中氮元素的质量分数为10.37％，它的结构简式可能是 [　　] A． B． C． D．