There are many ways for us to learn English. Different people have different ways. But I think the best way to learn English is1it. Do you 2 with me?

    Listening, speaking, reading and writing are all very3 in learning English. So we should learn the four English skills. While learning English, we need to4 many words, grammar(语法)rules and know about 5cultures. Some people learn English by listening to the 6 or watching TV. They try to 7 English with their friends every day. You don't need to care how badly you speak. The more you speak, the better your English will become. Some people go to the English corner to 8English. They also read English storybooks very often. When they meet a new word，they will look it up (查阅) in 9 You should also practice 10 in English every day.

    Keep trying and working hard to improve your English.

2013年10月14日上午，受台风“百合”影响，海南省三沙市永兴岛刮起12级大风，附近海域狂风巨浪，整个天空风雨交加，永兴岛码头掀起10多米大浪。读图回答下列问题。

仅含碳、氢两种元素的有机物叫烃，碳原子数在4及4以下的烃在常温常压时通常为气体．常温常压时烃C₂H₄和另一种烃组成的混合气体中碳元素的质量分数为87%，则另一种烃可能是（   ）

  $\frac{3}{5}$ 千克表示把3千克平均分成____份，取其中的____份，每份是____千克；也表示把____千克平均分成____份，，取其中的____份，每份是____千克。