在氢气跟氧气的反应中，破坏1mol氢气中的化学键消耗的能量为A，破坏1mol氧气中的化学键消耗的能量为B，形成1mol水中的化学键释放的能量为C．则下列关系正确的是（ ）
A．A+B＞C
B．A+B＜C
C．2A+B＜2C
D．2A+B＞2C
氢气跟氧气的反应的化学方程式为2H2+O2=2H2O，因燃烧反应为放热反应，断开旧的化学键吸收的总能量小于形成新的化学键放出的总能量，即2A+B＜2C，故选：C．
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| 1. If you want to know something about Japan, which of the following programmes would be the best one? | |||||
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| A. Weather report. B. China'99. C. Around the world. D. Animal world | |||||
| 2. You are a basketball fan (球迷). You may watch TV at _____. | |||||
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| A. 19:00 on Channel 2 B. 19:40 on Channel 1 C. 20:20 on Channel 2 D. 21:15 on Channel 1 |
| 3. How long does the TV play "Sisters" last? |
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| A. 30 minutes. B. 50 minutes. C. 90 minutes. D. 120 minutes |
| 4. You can watch the ______ programmes if you want to learn English on TV. |
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| A. News in English. B. English classroom C. English for today D. All the above |