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Discusswithyourclassmateswhetherthereareanyproblemsinthefollowingletterandhowyoucanimproveit,Thencontrastyourimprovedletterwiththeoriginalone.DearMrs.Green:WeregrettoinformyouthattheSilverStreakmountainbicycleaboutwhichyouinquiredisoutofstockuntiltheendofJanuary.ThismeansthatyouwillnotbeabletopurchasethismodelbeforeChristmas.However,youmightbeinterestedinoneofthebicycles intheenclosedbrochurewhichwecandeliverimmediately.Ifso,pleasedfeelfreetocontractus.Sincerely,RedScanlon

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Makearesponsetothefollowingletters,applyingthewritingprinciplesdiscussedinthischapter.DearSir/Madam:Weknowyourfirmfromtheadinthemagazine.Weareinterestedinyourwashingmachines,particularlyModel951135,foruseinfactory.Wouldyoupleasesendusacopyofyourillustratedcatalogandthelatestpricelist?Welookforwardtohearingfromyou.Yourssincerely,HarryWang

由半导体材料制成的热敏电阻，是（）温度系数，其电阻值随着温度的升高而（）。

A. 正升高
B. 正降低
C. 负升高
D. 负降低

热电材料，都有一个特定温度，称居里温度。只有（）居里温度，材料才有自发极化性质。

A. 高于
B. 低于
C. 等于
D. 不确定

热释电探测器能探测的光辐射包括：

A. 调制辐射
B. 脉冲辐射
C. 稳恒辐射
D. 以上都不是