城市产生和发展的基础是( )资源。A．矿产 B．土地 C．森林 D．水

某企业职工人数比上年增加4%，职工工资水平提高了5%，则企业职工工资总额比上年增长（）。

A.9%

B.9.2%

C.12%

D.20%

(8分)碘在科研与生活中有重要的应用。某兴趣小组用0.50mol·L^-1KI 、0.2％淀粉溶液、0.20mol·L^-1K₂S₂O₈、0.10mol·L^-1 Na₂S₂O₃等试剂，探究反应条件对化学反应速率的影响。已知S₂O₈^2—+2I^—=2SO₄^2—+I₂ (慢)  I₂ +2S₂O₃^2—=2I^—+S₄O₆^2—（快）

（1）向KI 、Na₂S₂O₃与淀粉的混合溶液中加入一定量的K₂S₂O₈溶液，当溶液中   （写离子符号）耗尽后，溶液颜色将由无色变为蓝色，为确保能观察到蓝色，S₂O₃^2—与S₂O₈^2—初始的物质的量需满足的关系为n（S₂O₃^2—）︰n（S₂O₈^2—）     。    

（2）为探究反应物浓度对化学反应速率的影响，设计的实验方案如下表：

表中V_X=      mL，理由是                                            。

基层俱乐部在（）的领导下开展工作。

A、党支部

B、团支部

C、党支部和军人委员会

D、军人委员会

由于网上委托处于全开放的互联网之中，因此除了具有其他委托方式所共有的风险外，投资者还应充分了解和认识到其存在且不限于以下哪些风险( )。

A．由于互联网和移动通讯网络数据传输等原因，交易指令可能会出现中断、停顿、延迟、数据错误等情况

B．投资者账号及密码信息泄露或客户身份可能被仿冒

C．由于互联网和移动通讯网络上存在黑客恶意攻击的可能性，网络服务器可能会出现故障及其他不可预测的因素，行情信息及其他证券信息可能会出现错误或延迟

D．投资者的网络终端设备及软件系统可能会受到非法攻击或病毒感染，导致无法下达委托或委托失败

Children whose biological parents both have Tic Syndrome Z (TSZ), which is characterized by the involuntary contraction of certain muscles, are about four times more likely to develop such contractions than are children whose biological parents do not have TSZ. It is likely, therefore, that predisposition to TSZ is an inherited trait.
Which of the following, if true, would most strengthen the conclusion above

A．Children whose parents have TSZ are more likely to develop TSZ if they are under unusual stress at school or at home than if they are not under such stress.

B．Children whose biological parents do not have TSZ are more likely to develop TSZ if they are raised by adoptive parents with TSZ than if they are raised by their biological parents.

C．Children whose biological parents have TSZ are as likely to develop TSZ if they are raised by adoptive parents who do not have TSZ as if they are raised by their biological parents.

D．Children whose biological parents have TSZ and who develop TSZ usually avoid developing a severe form of the syndrome if they seek treatment for TSZ shortly after developing the first signs of it.

E．(E) Children with TSZ whose biological parents do not have TSZ are less likely to have the syndrome diagnosed when symptoms first appear than are children with TSZ whose biological parents have TSZ.