有位中学生说：“当青春来临时，就该铺起通向理想之巅的路，让理想成为我们驰骋人生的坐骑。”这句话表明了（    ）

为了探索生命起源的问题，各国科学家进行了多种实验，比较著名的实验是米勒模拟原始地球条件合成有机物的实验。米勒设计了一套装置，他先将装置中的空气抽出，然后通入甲烷、氨、水蒸气等，并在装置中多次连续火花放电，经过了一段时间，在装置中检验出了氨基酸等有机小分子物质，他为探索生命起源作出了巨大的贡献。根据以上提供的材料回答问题：
（1）向实验装置中通入的甲烷、氨、水蒸气等气体相当于原始地球表面的____ ，与现在的大气成分相比，其主要区别是不含有____ ；在装置中多次连续火花放电相当于原始地球上的____ 现象；实验装置中检验出的氨基酸是一种____ 物质，在实验装置里形成的液体相当于____ 。
（2）米勒的这个实验表明了：在原始地球的条件下，由____ 物质形成____ 物质是可能的。

实现上述功能的VB程序如下，但横线处代码有错，请改正。

Private Sub Command1_Click()

    Dim a As String

    Dim x As Integer, s As Integer, k As Integer

    a = Text1.Text

    x = 1: s = 0: k = 0

    For i = 1 To Len(a)

        '如果输入的不是0到9的数字或者空格，则给出错误提示后结束子程序

        If (Asc(Mid(a, i, 1)) < 48 Or Asc(Mid(a, i,1)) > 57)  or(Asc(Mid(a,i,1))= 32)  then’____Label1.Caption = "只能输入数字或空格"

            Exit Sub

        End If

        If Mid(a, i, 1) = " " Then

            s = s + Mid(a,x,i)’____

            x = i + 1

            k = k + 1

        End If

    Next i

    Label1.Caption = "这" + Str(k) + "个数的和为:" + Str(s)

End Sub

    Diets have changed in China-and so too has its top crop. Since 2011,the country____（grow）more corn than rice. Corn production has jumped nearly 125 percent over____past 25 years, while rice has increased only 7 percent.

    A taste for meat is____(actual) behind the change. An important part of its corn is used to feed chickens, pigs, and cattle. Another reason for corn's rise. The government encourages farmers to grow corn instead of rice____(improve) water quality. Corn uses less water____rice and creates less fertilizer(化肥) runoff. This switch has decreased____(pollute) in the country's major lakes and reservoirs and made drinking water safer for people.

    According to the World Bank, China accounts for about 30 percent of total____(globe)fertilizer consumption. The Chinese Ministry of Agriculture finds that between 2005-when the government ____ (start) a soil-testing program ____ gives specific fertilizer recommendations to farmers - and 2011, fertilizer use dropped by 7.7 million tons. That prevented the emission(排放) of 51.8 million tons of carbon dioxide. China's approach to protecting its environment while ____ (feed) its citizens "offers useful lessons for agriculture and food policymakers worldwide." says the bank's Juergen Voegele.