每次焰色反应实验都要用试剂洗净铂丝，这种试剂是……（）

A、Na₂CO₃溶液       B、NaOH溶液       C、硫酸       D、盐酸

It’s high time you had your hair cut ; it’s getting _______ .

A. too much long       B. much too long

C. long too much       D. too long much

Jenny nearly missed the flight______ doing too much shopping. 

A. as a result of      B. on top of    C. in front of      D. in need of

I’m sure that your letter will get______ attention. They know you’re waiting for the reply.

 A. continued   B. immediate   C. careful   D. general

下列化学反应的离子方程式正确的是（   ）

A．在稀氨水中通入过量CO₂:NH₃·H₂O+CO₂=NH+HCO

B．少量SO₂通入Ca(ClO)₂溶液中：SO₂+H₂O+Ca²⁺+2ClO^-=CaSO₃+2HClO

C．用稀HNO₃溶液FeS固体：FeS+2H⁺=Fe²⁺+H₂S

D．氢氧化钙溶液与等物质的量的稀硫酸混合：Ca²⁺+OH^-+H⁺+SO=CaSO₄+H₂O

It is often ______ that human beings are naturally equipped to speak.

A. said       B. to say     C. saying     D. being said

They use computers to keep the traffic _______ smoothly. 

A. being run       B. run         C. to run        D. running

Progress______ so far very good and we are sure that the work will be finished on time.

A. was       B. had been    C. has been    D. will be

It’s high time you had your hair cut ; it’s getting _______ .

A. too much long       B. much too long

C. long too much       D. too long much

下列各组词语中加点的字的读音，与所给字音都相同的一组是

A．宏（hóng）  彩虹  弘扬  鸿篇巨制  洪钟大吕

B．鲜（xiān）  纤绳  籼米  白浪掀天  鲜为人知

C．缴（jiǎo） 剿除  剿袭  脚踏实地  矫枉过正

D．颤（chàn）   颤栗  忏悔  胁肩谄笑  馋涎欲滴