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【单选题】
当波源向着静止的观察者运动时，观察者接收到的波的频率大于波源振动的频率，原因是[ ]。A.
观察者接收到的波的 波速增大
B.
观察者接收到的波的 波速减小
C.
观察者接收到的波的 波长增大
D.
观察者接收到的波的 波长减小
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【单选题】听力原文：Rex Jink, the manager in charge of accounts would like to remind employees that all end-of-year expense claims are due before the end of next week. Any claims that are received by the claims depa...
A.
To remind employees of a party
B.
To ask workers to file expenses
C.
To check to see if workers have been paid
D.
To help employees understand taxation
【单选题】Go straight. Cross Grand Street. It’s on your (left), just opposite the park.
A.
左边
B.
右边
C.
离开
【简答题】We would remind you that the offer made in our last letter is valid for one month from the date of the letter.
【简答题】______ would remind the tourists of the untimely death of a modem U.S. president.
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【单选题】Go straight. Cross Grand Street. It’s on your (left), just opposite the park.
A.
左边
B.
右边
C.
离开