下列合同中，不是必须采用书面形式的是（　）。 A．融资租赁合同 B．建设工程合同

2013年5月，华夏国际旅行社（以下简称"旅行社"）组织甲、乙两个假日旅游团：（1）甲团是由36人组成的境内旅游团。旅行社向每人收取费用人民币4500元。旅行期间，旅行社为每人支付交通费人民币1600元，住宿费人民币400元，餐费人民币300元，公园门票等费用600元；（2）乙团是由30人组成的境外旅游团。旅行社向每人收取费用人民币6800元，在境外该团改由当地W旅游公司接团，负责在境外安排旅游，旅行社按协议支付给境外W旅游公司旅游费折合人民币144000元。已知：营业税税率为5%。要求：根据上述资料，回答下列（1）～（4）小题。

乙团应纳营业税为（）万元。

A.10200

B.6120

C.3000

D.1800

集合行为中主要的信息传播方式是（）。

某研究性学习小组为了研究Cu与浓H₂SO₄的反应，设计如下实验探究方案（装置中的固定仪器和酒精灯均未画出）

实验选用细铜丝、98.3%H₂SO₄、品红溶液、澄清石灰水、CC1₄、NaOH溶液等药品，铜丝被卷成螺旋状，一端没入浓H₂SO₄中，另一端露置在液面上方。

以下是该学习小组部分交流记录及后续探究实验的记录。

材料一：小组交流滴录

学生1：加热前，无现象发生；加热后，液面下铜丝变黑，产生气泡，有细小黑色颗粒状物质从铜丝表面进入浓硫酸中，黑色物质是什么？值得探究！

学生2：我也观察到黑色颗粒状物质，后来逐渐转变为灰白色固体，我想该灰白色固体极有可能是未溶于浓硫酸的CuSO₄。

学生3：你们是否注意到液面以上的铜丝也发黑，而且试管上部内壁有少量淡黄色S固体凝

聚，会不会液面以上的铜丝与硫发生了反应，我查资料发现：2Cu+S=Cu_2­S（黑色）。

材料二：探究实验剪辑

实验1：将光亮的铜丝在酒精灯火焰上灼烧变黑，然后插入稀硫酸中，铜丝重新变得光亮，溶液呈蓝绿色；将光亮的铜丝置入加热的硫蒸气中变黑，然后插入稀硫酸中无变化。

实验2：截取浓硫酸液面上方变黑的铜丝，插入稀硫酸中无变化；将浓硫酸液面下方变黑的铜丝，插入稀硫酸、黑色明显变浅，溶液呈蓝绿色。

实验3：将溶液中的黑色颗粒状物质，经过滤、稀硫酸洗、蒸馏水洗、干燥后放入氧气流中加热，然后冷却，用电子天平称重发现质量减少10%左右。

根据上述材料回答下列问题：

（1）D、E两支试管中CC1₄的作用是                    ；

（2）加热过程中，观察到A试管中出现大量白色烟雾，起初部分烟雾在试管上部内壁析出淡黄色固体物质，在持续加热浓硫酸（沸腾）时，淡黄色固体物质又慢慢地消失。写出淡黄色固体消失的化学反应方程式：                    ；

（3）对A试管中的浓H₂SO₄和铜丝进行加热，很快发现C试管中品红溶液褪色，但始终未见D试管中澄清石灰水出现浑浊或沉淀。学生1猜想是由于SO₂溶解度较大，生成了Ca（HSO₃）₂的缘故。请你设计实验验证学生1的猜想                 

                                                           ；

（4）根据上述研究，结合所学知识，你认为液面下方铜丝表面的黑色物质成分是                                              ；（写化学式）

（5）反应完全后稀释溶液呈酸性，学生2猜想反应中浓硫酸可能过量，请你设计一个简单的实验以验证稀释后的溶液由于硫酸过量呈酸性，                            。

阅读理解。

     It is hard to track the blue whale, the ocean's largest creature which has almost been killed off by

commercial whaling and is now listed as an endangered species. Attaching radio equipment to it is

difficult and visual sightings are too unreliable to give real insight into its behavior.

     So biologists were delighted early this year when with the help of the Navy they were able to track a

particular blue whale for 43 days monitoring its sounds . This was possible because of the Navy's

formerly top-secret system of underwater listening equipment spanning (估量) the oceans . Tracking

whales is but one example of an exciting new world just opening to civilian scientists after the cold war

as the Navy starts to share and partly uncover its global network of underwater listening system built

over the decades to track the ships of potential enemies .

     Earth scientists announced at a news conference recently that they had used the system for closely

monitoring a deep-sea volcanic eruption for the first time and that they plan similar studies. Other

scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean

and global temperatures. The speed of sound in water is roughly one mile a second-slower than through

land but faster than through air. What is most important , different layers of ocean water can act as

channels for sounds focusing them in the same way a stethoscope (听诊器) does when it carries faint

noises from a patient's chest to a doctor's ear. This focusing is the main reason that even relatively weak

sounds in the ocean especially low frequency ones can often travel thousands of miles.

1. The passage is chiefly about        .

A. an effort to protect an endangered marine species

B. the civilian use of a military detection system

C. the exposure of a U. S. Navy top-secret weapon

D. a new way to look into the behavior of blue whales

2. The underwater listening system was originally designed        .

A. to mark and locate enemy ships

B. to monitor deep-sea volcanic eruptions

C. to study the movement of ocean currents

D. to replace the global radio communications network

3. The deep-sea listening system makes use of        .

A. the complex technology of focusing sounds under water

B. the capability of sound to travel at high speed

C. the special quality of layers of ocean water in sending out sound

D. low-frequency sounds traveling across different layers of water

4. It can be inferred from the passage that        .

A. new radio equipment should be developed for tracking the endangered blue whales

B. blue whales are no longer endangered with the use of the new listening system

C. opinions differ as to whether civilian scientists should be allowed to use military technology

D. military technology has great potential in civilian use

5. Which of the following is true about the U. S. Navy underwater listening network ?

A. It is now partly used by civilian scientists.

B. It has been replaced by a more advanced system.

C. It became useless to the military after the cold war.

D. It is necessary in protecting endangered species.

采用0~8mm针状焦、超高石墨碎、煤沥青为原料的制品是（）

A、Φ310超高接头

B、Φ400

C、Φ500高功率

D、Φ500超高功率