what chemicals did you use to treat the boiler water ?when you test alkalinity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .

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—Where____you____lunch?

—Athome．Therewasnoschoollunch

A．did；have

B．are；having

C．will；have

D．do；have

正确答案：A

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A. don’t

B. does

C. did

参考答案：A

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17．答案为D。为什么你已经有个好工作，还要找新工作?分析整句结构，从句做状语，只有 D为正确选项。

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第8题：

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正确答案：C

第10题：

You look（） What（）you（）?

Atire；did；do

Btiring；have；done

Ctired；do；do

Dtired；have；been doing

D
略

what chemicals did you use to treat the boiler water ?when you test alkalin

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