上海世博会为实现园区内外交通“零排放”，采用了数百辆氢燃料电池车，如图是氢燃料电池的工作原理．
（1）氢燃料电池车能实现交通“零排放”的原因是______．
（2）H2在空气中燃烧火焰呈______色，在氢燃料电池中能看到这种现象吗？______（填“能”或“不能”）．
（3）写出H2在空气中燃烧的化学方程式______．
（1）氢燃料电池车能实现交通“零排放”的原因是燃料电池的化学反应过程不会产生有害产物；
（2）H2在空气中燃烧火焰呈淡蓝色，氢氧燃料电池是温和的氧化还原反应，不是燃烧，不产生火焰；
（3）氢气燃烧的生成了水，反应的方程式是：2H2+O2
2H2O． 点燃 .
故答为：（1）化学反应过程中不会产生有害产物；（2）淡蓝，不能；（3）2H2+O2
2H2O． 点燃 .
| 阅读理解。 |
| As a large part of land in Hawaii is rocky and mountainous, the state has little space in which to grow crops. Some areas are also covered with hard, black lava (熔岩) on which nothing can grow. Even so, Hawaii produces large quantities of farm products. The volcanic (火山的) soil in the valleys and lowlands is very rich, and the warm climate makes it possible to grow crops all year long. Rainfall is plentiful on the northern and eastern sides of each island. Much of the land on the southern and western sides of each island receives too little rainfall for most crops to grow well, but in many of the places where rainfall is light, wells and mountain streams supply water for irrigation. |
| 1. The main purpose of the passage is to describe the Hawaii _____. |
[ ] |
| Ａ: geography Ｂ: market system Ｃ: farming conditions Ｄ: living conditions |
| 2. Where is most of the farming done in Hawaii? |
[ ] |
| Ａ: Along the coast Ｂ: On the mountain sides Ｃ: On the lava beds Ｄ: In the lowlands |
| 3. When is the Hawaiian growing season? |
[ ] |
| Ａ: Throughout the entire year Ｂ: During all seasons except winter Ｃ: Mainly in the spring and summer Ｄ: Only during the long summer months |
| 4. How do dry areas in Hawaii get their water? |
[ ] |
| Ａ: It is carefully collected when it rains. Ｂ: It is stored in mountain reserviors. Ｃ: It is brought in from other areas. Ｄ: It is provided by wells. |
| 5. Which of the following is right? |
[ ] |
| Ａ: There are quite a few mountains in Hawaii. Ｂ: Hawaii produces large quantities of farm products because of its little plantable space. Ｃ: The soil in Hawaii is very rich everywhere. Ｄ: The climate in Hawaii is warm for its mountain streams. |