2、常见吸热反应：⑴Ba(OH)₂·8H₂O+NH₄Cl，⑵C+CO₂或H₂O_(g)，⑶一般分解反应都是吸热反应，⑷电离，⑸水解等。

化学反应都有新物质生成，同时伴有能量的变化，据此可把反应分为：

1、放热反应：　　　　　　　　　　　　 。 吸热反应：　　　　　　　　　　　　 　。

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

207. ________ the general state of his health, it may take him a while to recover from the operation.

A. Given 　　B. To give 　C. Giving 　D. Having given