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【单选题】
调频是指载波的( )随着调制信号的幅度的变化而变化A.
幅度
B.
频率
C.
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举一反三
【简答题】A. The women don't want to go to any more barbecues. B. The guests are late because of the weather. C. Everybody should help with the cooking. D. The weather wasn't good on last barbecue.
【单选题】You mustn't mind ______ trouble over the cooking if you want your guests to enjoy their meal.
A.
take
B.
to take
C.
taking
D.
taken
【单选题】In the U.S.A,guests will say"______"to the host who offers something they don't want
A.
.No,thanks
B.
.Yes,please
C.
Help yourself
D.
I don't want it
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