问题
单项选择题
以下关于孕母情况对胎儿生长发育的影响错误的叙述是（）
A.孕母缺乏维生素A可导致胎儿先天性神经管发育畸形
B.妊娠早期感染风疹可导致胎儿先天畸形
C.孕母严重营养不良可引起流产、早产
D.孕母接受放射线环境污染可使胎儿发育受阻
E.宫内发育阻滞可影响小儿出生后的生长发育
答案
参考答案：A
解析：孕母缺乏叶酸可导致胎儿先天性神经管发育畸形。
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以下关于孕母情况对胎儿生长发育的影响错误的叙述是（）
A.孕母缺乏维生素A可导致胎儿先天性神经管发育畸形
B.妊娠早期感染风疹可导致胎儿先天畸形
C.孕母严重营养不良可引起流产、早产
D.孕母接受放射线环境污染可使胎儿发育受阻
E.宫内发育阻滞可影响小儿出生后的生长发育
参考答案：A
解析：孕母缺乏叶酸可导致胎儿先天性神经管发育畸形。
import java.awt.*;import java.applet.*;/* */public class ex13_3 extends Applet{ private Button btnClear; private CheckboxGroup cbg; private Checkbox chk1, chk2; private int upX, upY;private int downX, downY;private boolean bDraw, bClear, bStyle; public void init(){ bDraw = false; bClear = false; bStyle = false; setLayout(null); cbg = new CheckboxGroup(); chk1 = new Checkbox("Hollow", cbg, true); chk2 = new Checkbox("Filled", cbg, false); chk1.reshape(80,getSize().height-80,80,25); chk2.reshape(160,getSize().height-80,80,25); add(chk1); add(chk2); btnClear = new Button("clear"); btnClear.reshape(240,getSize().height-80,80,25); add(btnClear); } public void paint(Graphics g){ if(bDraw){ if(upX > downX && upY > downY){ if(bStyle) g.fillRect(downX, downY, upX - downX, upY - downY); else g.drawRect(downX, downY, upX - downX, upY - downY);}else if(upX > downX && upY < downY){ if(bStyle) g.fillRect(downX, upY, upX - downX, downY - upY); else g.drawRect(downX, upY, upX - downX, downY - upY);}else if(upX < downX && upY > downY){ if(bStyle) g.fillRect(upX, downY, downX - upX, upY - downY); else g.drawRect(upX, downY, downX - upX, upY - downY);}else if(upX < downX && upY < downY){ if(bStyle) g.fillRect(upX, upY, downX - upX, downY - upY); else g.drawRect(upX, upY, downX - upX, downY - upY);}bDraw = false; } if(bClear){g.clearRect(0,0, getSize().height, getSize().width);bClear = false; } } public void update(Graphics g){ paint(g); } public boolean mouseUp(Event e, int x, int y){ upX = x; upY = y; bDraw = true; repaint(); return true; } public boolean mouseDown(Event e, int x, int y){ downX = x; downY = y; return true;} public boolean action(Event e, Object o){ if(e.target == btnClear){bClear = true;repaint(); } if(chk1.getState() == true){bStyle = true; } if(chk2.getState() == true){bStyle = false; } return true; } }ex13_3.html