一个长方体纸箱，长5分米，宽3分米，高4分米，它所有的棱长的和是______分米

出境粮食和饲料检验有效期最长不超过两个月，检疫有效期一般为30天，黑龙江、吉林、辽宁、内蒙古和新疆地区冬季（11月至次年2月底）可酌情延长至40天。（）

对耳、肾有毒的药物是()

A．卡那霉素

B．庆大霉素

C．异烟肼

D．维生素C

E．葡萄糖

项目结构图与用于（）的编码有紧密的有机联系。

A.投资控制

B.进度控制

C.安全控制

D.质量控制

E.合同管理

甲有一台中央空调主机急欲出手，即委托乙寻找买主，并约定事后给乙1000元酬谢。不久，甲的朋友丙听说甲积压了一台中央空调主机急欲出手，即主动帮忙联系。很快丙即找到买主丁，以30万元买下甲的中央空调主机。丙为办此事花掉电话费、车费等600元。不久，乙也找到买主欲购买甲的中央空调主机。但甲称已无货可卖，乙即要求甲支付报酬1000元，及为办此事支付各项费用500元，甲拒绝。此时，丙听说甲委托乙寻找买主，并许以千元报酬之事，即要求甲支付1600元，甲拒绝。下列陈述不正确的是( )。

A．甲应向丙支付各项费用600元

B．甲应向丙支付报酬1000元

C．甲应向乙支付报酬1000元

D．无需向丙支付任何费用

Optimism is the art of always seeing the glass half full (1) half empty, finding something positive in even the most (2) of situations and last but not least the ability to expect the best even if the chances are (3) . It enables you to try new things, deal with failure as a learning experience (4) a stopping point. In general optimism gives you a reason to live. The world would be a better place if it was full of optimism, (5) unfortunately the trend in today’s youth is (6) the opposite way. Today it is (7) to be pessimistic. One could spend hours discussing how we arrived at this point, (8) our youth refuses to smell the roses and instead prefers to (9) themselves on their own pessimistic (10) .

Optimism is not an (11) gift but rather a learned behavior (12) . Like most behaviors optimism is best learned by watching examples, (13) you. The first step in creating a generation of people with a positive outlook on life, is to (14) life on the bright side yourself. (15) it would be wrong to (16) your child from all negativity, it is important that you are not the (17) of doubts and worries. Finding something positive in a negative situation needs to be (18) Show how to make the best of things by always (19) the positive, by encouraging your child after a(n) (20) and by explaining over and over that failure is just a part of progress.

9（）

A.celebrate

B.choke

C.linger

D.repress