问题
选择题
直线y=kx过点（3，4），那么它还通过点（ ）
A．（3，-4）
B．（4，3）
C．（-4，-3）
D．（-3，-4）
答案
∵直线y=kx过点（3，4），
∴把点代入直线解析式可得k=
，4 3
∴直线解析式为y=
x，4 3
∴分别把点代入即知还过点（-3，-4），
故选D．
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直线y=kx过点（3，4），那么它还通过点（ ）
A．（3，-4）
B．（4，3）
C．（-4，-3）
D．（-3，-4）
∵直线y=kx过点（3，4），
∴把点代入直线解析式可得k=
，4 3
∴直线解析式为y=
x，4 3
∴分别把点代入即知还过点（-3，-4），
故选D．
Several days ago, some students from the US visited our school. When we talked, I found __1__ differences in school life between the US and China. For example, each class __2__fifty minutes in the US. It is a little__3_than that in China. We usually have forty-five minutes in each class. Another difference is that they have less break time between__4__. Besides, although most schools in both countries finish their__5__classes at 12 o’clock, the students in the US only have _6__break, so they need to eat lunch quickly. Their afternoon classes begin at 1:00 pm and school is over at __7__ 3:00 pm. Then they take part in club activities or play sports. Many Chinese students don’t work during their high school years, __8__ the US students like to find a part-time job(兼职) in their free time. They don’t have a dream job in mind. They think __9__ is no difference between jobs. Working is a useful experience for them and they make money at the same time. Some of them even take one-year full-time jobs__10__they leave high school and then go to college.
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