We sent the letter by airmail （以便他们能及时收到）.

[单选题]They sent the letter to me ______ mistake.A.byB.forC.onD.with

[单选题]We are in receipt of your letter dated Jan 8, ____ we are pleased to learn that you want to order 100 tons of the subject goods.A . in whichB . from whichC . to whichD . at which

[单选题]We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.A . whichB . atwhichC . fromwhichD . inwhich

[试题]3.We have explored or sent robot spaceships to the［A］themoon［B］Venus［C］Jupiter［D］Mars

[单选题]We thank you for your letter of May 17 and the（）catalogue.A . sentB . enclosedC . givenD . presented

[单选题]We（）your letter of Nov.3 asking us to make a quotation.A . go overB . have readC . refer toD . check up

[单选题]We（）your letter of Nov. 3 asking us to make a quotation.A . gooverB . havereadC . refertoD . checkup

[单选题]27． From the letter we can conclude(得出结论) that ．A． Alice isn't happy with her teachersB． Alice's parents made her study too hardC． Alice didn't get along well with her classmatesD． Alice didn't want to go to school any more

[单选题]氯乙烯气柜高度采用（），以便能及时调节机后回流量。A . 压差报警装置B . 位差报警装置C . 压力报警装置

[填空题] 大多数盲人能及时避开障碍物，这是因为他们具有（）。