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【单选题】
下面说法错误的是( )A.
任何的变量均被视为一个矩阵（数组），单一的数被看作1×1矩阵
B.
在赋值过程中，如果变量已存在，MATLAB将使用新值代替旧值，并以新的变量类型代替旧的变量类型
C.
变量名以字母开头，变量名中可以包含字母、数字和下划线，可以使用标点
D.
常量是指在计算过程中不变的量
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【单选题】when ( )you ( ){buy } this radio?
A.
are …… buy
B.
did …… buy
C.
are ...buying
D.
do buy
【单选题】It will be _____ if you buy a return ticket on the train when you travel in England. [ ]
A.
much cheap
B.
more cheaply
C.
much cheaper
【简答题】When you buy the spare parts for your car， try to get the _______ ones from the authorized dealer. A.genuine B.generous C.genius D.gentle
【单选题】If you buy something from abroad, you should pay ______ on it when you go through the customs.
A.
rates
B.
taxes
C.
fines
D.
duties
【简答题】6 Insuran ce when you go somewhere :
【单选题】— What a beautiful dress！Can you tell me _______? — Just the day before yesterday.
A.
when do you buy it
B.
when you buy it
C.
when you bought it
D.
when did you buy it
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