8个月以上小儿应进行的计划免疫制剂为（） A.麻疹疫苗 B.乙型脑炎疫苗 C.卡介苗

MOH和ROH两种一元碱的稀溶液，分别加水稀释时pH变化可近似看作如图所示，下列说法错误的是（　　）

A．ROH是一种强碱

B．稀释前，c（ROH）＜10c（MOH）

C．在x点，ROH完全电离

D．在x点，c（M⁺）＜c（R⁺）

毛 * * 曾评论说：康熙皇帝头一个伟大贡献是打下了今天我们国家所拥有的这块领土，我们今天继承的这大块版图基本上是康熙皇帝时牢固地确定了的。清朝康熙皇帝为维护国家统一和抗击外国侵略而采取的措施是（）①平定回部贵族叛乱②从荷兰殖民者手中收复台湾③平定准噶尔叛乱④组织雅克萨之战抗击沙俄侵略

A.①②

B.③④

C.②③④

D.①②③

水利工程建设项目验收主持单位应当成立验收委员会（验收工作组）进行验收，验收结论应当（）以上验收委员会（验收工作组）成员同意。

A.三分之一

B.二分之一

C.三分之二

D.四分之三

什么是明暗形成的三要素？

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.

7（）

A.sensible

B.faulty

C.cool

D.appreciated