磕头有什么讲究？

一辆货车运一批煤，第一天运了总数的25%，第二天运了总数的28%，已知第一天比第二天少运6吨，这批煤共有多少吨？

过点P（2，3）作直线，使它与两坐标轴围成的三角形面积为12，这样的直线可以作______条．

About ten men in every hundred suffer from color blindness in some way. Women are luckier，only about one in two hundred is affected in this matter. Perhaps, after all, it is safer to be driven by a woman.

There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shades of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man see everything in shades of green—a strange world indeed.

Color blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called "cones". These help us to see in a bright and tell difference between colors. There are also millions of "rods ", but these are used for seeing when it is nearly dark. They show us shape but no color.    Some insects have favorite colors. Mosquitoes(蚊子) like blue but do not like yellow. A red light will not attract insects, but a blue lamp will. In a similar way human being also have favorite colors. Yet we are lucky. With the aid of the cones in our eyes we can see many beautiful colors by day, and with the aid of the rods we can see shapes at night, One day we may even learn more about the invisible colors around us.

小题1:According to the passage, with the help of the "cones", we can        

A．tell different colours

B．see in a weak light

C．tell different shapes

D．tell orange from yellow小题2: Why do some people say it is safer to be driven by women?

A．Women are more careful.

B．There are fewer color-blind women.

C．Women are fonder of driving than men.

D．Women are weaker but quicker in thinking.小题3:Which of the statements about the color-blind is true?

A．Not all of them have the same problem in recognizing colors.

B．None of them can see deep red.

C．None of them can tell the difference between blue and green.

D．All of them see everything in shades of green.小题4:We can attract and kill mosquitoes by using a        

A．red light

B．yellow light

C．blue light

D．green light

患者外感风邪，头痛，恶寒发热。目眩，鼻塞，舌苔薄白，脉浮。治疗宜选用（）

A．川芎

B．丹参

C．郁金

D．牛膝

E．益母草

在C盘当前文件夹下建立一个名为StuData. txt的顺序文件。要求用InputBox函数输入5名学生的学号(StuNo)、姓名(StuName)和英语成绩(StuEng)。 Private Sub Form Click() Open"C: StuData. txt"For OutPut As#1 Fori=1 To 5 StuNo=InpuzztBox(“请输入学号”) StuName=InputBox(“请输入姓名”) StuEng=Val(InputBox(“请输入英语成绩”)) 【15】 Next iClose#1End Sub