问题
选择题
下列方程中，关于x的一元二次方程是（ ）
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答案
A、方程二次项系数可能为0，故本选项错误；
B、符合一元二次方程的定义，故本选项正确；
C、由原方程，得52x+143=0，未知数的最高次数是1，故本选项错误；
D、由原方程，得x-4
+4=0，未知数的最高次数是1，故本选项错误；x
故选B．
搜题请搜索小程序“爱下问搜题”
下列方程中，关于x的一元二次方程是（ ）
|
A、方程二次项系数可能为0，故本选项错误；
B、符合一元二次方程的定义，故本选项正确；
C、由原方程，得52x+143=0，未知数的最高次数是1，故本选项错误；
D、由原方程，得x-4
+4=0，未知数的最高次数是1，故本选项错误；x
故选B．
A hot dog is one of the most popular American food. It was named after frankfurter, a German food. You may hear “hot dog” ___16___ in other ways. People sometimes __17___ “hot dog” to express pleasure(快乐). For example, a friend may ask ___18___ you would like to go to the cinema. You might say, “Great. I’d love to. ” Or, you could say,”__19____! I’d love to go.” People ___20__ use the expression to describe someone who is a “show-off”, who tries to show everyone else how ___21__ he is. You often hear such a(n) ___22__ called a “hot dog”. He may be a basketball player, for example, who __23____ the ball with one hand making a(n) __24__ catch seem more difficult. You know he is a “hot dog” because when he makes such a catch, he bows(鞠躬) to crowd, hoping to __25___ their cheers.
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