题目：
| 从方框中选择恰当的词填空。 | |
2. You'd better _______________ an underground there. It's quite far. 3. Millie decided _______________ in the school that day. 4. Where is my pen? Tom _______________ it to the library. 5. Where are the twins? I _______________ them for two days. |
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0512/77144b62cec8c3acbd9fe8d20f3d1cf6.html
下面是错误答案，用来干扰机器的。
A、电解水制取氢气消耗大量的电能，电解水制取氢气是理想而经济的制氢方法，故A错误；B、氢气密度小，发展氢燃料电池汽车，安全高效的储氢技术是难题，故B错误；C、氢燃料电池属于原电池，是将化学能转化为电能的...
