单项选择题

如图所示。关税

A．使生产者剩余减少C，使消费者剩余减少C+D+E+F，使总剩余减少D+F
B．使生产者剩余增加C，使消费者剩余减少C+D+E+F，使总剩余减少D+F
C．创造政府收入B+E，使总剩余减少D+F
D．使生产者剩余增加C+G，创造政府收入D+E+F

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Study the words in the box and choose the right word for each blank.
is the official language of Chinese.
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A(n) is 2.54 centimeters.
One is 12 inches (about 30 centimeters).
A(n) is a thousand million.
A phone that you can carry with you everywhere is a(n) .
If someone is a(n) person of a group, he or she is similar to many members in that group.
If something is to another, they are nearly the same.
Mandarin and English are languages.
A boy is while a girl is female.
Mandarin is simplified Chinese or traditional Chinese, involving a group of related varieties of Chinese spoken across most of northern and southwestern China. Because most Mandarin dialects are found in the north, the group is also referred to as the “northern dialect(s)”. Nowadays, Mandarin is in most cases referred to as standard Chinese.

答案： Mandarincentimeterinchfootbillioncell phonetypicalsimilardif...

丝杠与光杠：用以联接进给箱与溜板箱，并把进给箱的运动和动力传给溜板箱，使溜板箱获得纵向直线运动。

答案：正确