化学与社会、生活密切相关。对下列现象或事实的解释正确的是（）。 A．现象或事实：用热

发布时间：2017-01-25 05:46 │ 来源：www.tikuol.com

题型：单项选择题

化学与社会、生活密切相关。对下列现象或事实的解释正确的是（）。

A．现象或事实：用热的烧碱液洗去抽污；解释：Na₂CO₃可直接与油污反应

B．现象或事实：漂白粉在空气中久置变质；解释：漂白粉中的CaCl₂与空气中的CO₂反应生成CaCO₃

C．现象或事实：FeCl₃溶液可用于铜质印刷线路板制作；解释：FeCl₃能从含Cu²⁺的溶液中置换出铜

D．现象或事实：施肥时，草木灰（有效成分为K₂CO₃）不能与NH₄Cl混合使用；解释：K₂CO₃与NH₄Cl反应生成氨气会降低

完型填空
What do you do at the weekend? Some people like to 1 but otherslike to go out for 2 or to play soccer. My friend Jack works hard in a factory during the 3 . At the weekend, he always does the 4 thing. On Saturday he 5 his car and on Sunday he goes with his family to a village by 6 . His uncle and aunt have a farm 7 . It isn't a big 8 , but there is always much to do on it. The children help to give the animals their 9 . Jack and his wife help in the fields. At the end of the day, they' re all 10 and Jack's aunt gives them a big meal.
( )1. A. go to work ( )2. A. a walk ( )3. A. day ( )4. A. good ( )5. A. drives ( )6. A. car ( )7. A. too ( )8. A. that ( )9. A. water ( )10. A. happy	B. stay at home B. shop B. year B. hard B. mends B. bus B. here B. this B. food B. thirsty	C. go hiking C. school C. holiday C. same C. washes C. train C. there C. it C. houses C. tired	D. see friends D. something D. week D. different D. takes D. bike D. near D. one D . vegetables D. hungry