在窗体上画一个名称为Text1的文本框，然后编写以下事件过程：Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer) If _________________ Then Text1.SelStart = 0 Text1.SelLength = Len(Text1.Text) End IfEnd Sub要求程序运行时，若输入焦点在Text1上，按下组合键Ctrl+A可以选取Text1内所有的文本，则在横线处应填入的表达式是________。 A: KeyCode = "A" And Shift = "Ctrl" B: KeyCode = 65 And Shift = 2 C: Text1.KeyCode = 65 And Text1.Shift = 2 D: Text1.KeyCode = "A" And Text1.Shift = "Ctrl"

在窗体上画一个名称为Text1的文本框，然后编写以下事件过程：Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer) If _________________ Then Text1.SelStart = 0 Text1.SelLength = Len(Text1.Text) End IfEnd Sub要求程序运行时，若输入焦点在Text1上，按下组合键Ctrl+A可以选取Text1内所有的文本，则在横线处应填入的表达式是________。 A: KeyCode = 65 And Shift = 2 B: Text1.KeyCode = "A" And Text1.Shift = "Ctrl" C: KeyCode = "A" And Shift = "Ctrl" D: Text1.KeyCode = 65 And Text1.Shift = 2

$\int_{0}^{\frac{\text{ }\!\!\pi\!\!\text{ }}{4}}{[\cos (2t)\mathbf{i}+\sin (2t)\mathbf{j}+t\sin t\mathbf{k}]}\operatorname{dt}=$( ) A: $(\frac{1}{2},\frac{1}{2},\frac{4-\text{ }\!\!\pi\!\!\text{ }}{4\sqrt{2}})$ B: $(1,\frac{1}{2},\frac{4-\text{ }\!\!\pi\!\!\text{ }}{4\sqrt{2}})$ C: $(\frac{1}{2},1,\frac{4-\text{ }\!\!\pi\!\!\text{ }}{4\sqrt{2}})$ D: $(1,1,\frac{4-\text{ }\!\!\pi\!\!\text{ }}{4\sqrt{2}})$

Text 1

已知齐次方程$(x-1){{y}^{''}}-x{{y}^{'}}+y=0$的通解为$Y={{C}_{1}}x+{{C}_{2}}{{e}^{x}}$，则方程$(x-1){{y}^{''}}-x{{y}^{'}}+y={{(x-1)}^{2}}$的通解是( ) A: ${{\text{C}}_{1}}x+{{\text{C}}_{2}}{{e}^{x}}-({{x}^{2}}+1)$ B: ${{\text{C}}_{1}}x+{{\text{C}}_{2}}{{e}^{x}}-({{x}^{3}}+1)$ C: ${{\text{C}}_{1}}x+{{\text{C}}_{2}}{{e}^{x}}-{{x}^{2}}$ D: ${{\text{C}}_{1}}x+{{\text{C}}_{2}}{{e}^{x}}-{{x}^{2}}+1$

Skim the text and answer the following questions. 1) What type of writing is the text?

Part 1 ： The text begins with an _________.

Fast reading text 1

从原点向曲线$$y=1-\ln x$$作切线，则由切线、曲线和$$x$$轴围成图形的面积为()． A: $$\frac{1}{2}{{\text{e}}^{2}}+\text{e}$$ B: $$\frac{1}{2}{{\text{e}}^{2}}-\text{e}$$ C: $${{\text{e}}^{2}}+\text{e}$$ D: $${{\text{e}}^{2}}-\text{e}$$

函数TEXT("2018/1/1","mm")返回值为1。