3、常見放熱反應(yīng)：⑴燃燒反應(yīng) ⑵活潑金屬+酸或水→H₂ ⑶中和反應(yīng) ⑷CaO +H₂O

⑸一般化合反應(yīng)是放熱反應(yīng)。

2、常見吸熱反應(yīng)：⑴Ba(OH)₂·8H₂O+NH₄Cl，⑵C+CO₂或H₂O_(g)，⑶一般分解反應(yīng)都是吸熱反應(yīng)，⑷電離，⑸水解等。

化學(xué)反應(yīng)都有新物質(zhì)生成，同時(shí)伴有能量的變化，據(jù)此可把反應(yīng)分為：

1、放熱反應(yīng)：　　　　　　　　　　　　 。 吸熱反應(yīng)：　　　　　　　　　　　　 　。

214. The lady said she would buy a gift for her daughter with the　

　　　 .

A. 20 dollars remained　　　　　 B. 20 dollars to remain

C. remained 20 dollars　　　　　 D. remaining 20 dollars

213. -Mum, why do you always make me eat an egg every day?

-　 　　　　enough protein and nutrition as you are growing up.

　　 A. Get　　　　　　　　　　　　　　　 B. Getting　

　　 C. To get　　　　　　　　　　　　　　 D. To be getting

212. There are five pairs　 　　　, but I'm at a loss which to buy.

　 A. to be chosen　　　　　　　　　　 B. to choose from

　 C. to choose　　　　　　　　　　　　 　D. for choosing

211. -Let me tell you something about the journalists.

　 　-Don't you remember　 　　　　me the story yesterday?

　 A. told　　　　　 　　　　　　　　　B. telling　

　 C. to tell　　　　　　　　　　　　 D. to have told

210. When I got back home I saw a message pinned to the door,　　　 “Sorry to miss you； will call later."

A. read　　　　　 B. reads　　　 C. to read　　　 D. reading

209. The purpose of new technologies is to make life easier,　 　　　　it more difficult.

　 A. not make　　　　　　　　　　　 B. not to make　　

　 C. not making　　　　　　　　　　 D. do not make

208. Robert is said　 　　　　abroad, but I don't know what country he studied in.

　 A. to have studied　　　　　　　　 B. to study　　　　　　

　 C. to be studying　　　　　　　　　 D. to have been studying