admob在android中坚持线性布局的顶部

我在xml中得到了这种线性布局

<LinearLayout   android:layout_gravity="bottom"
 android:layout_width="fill_parent" android:background="#FFF0F000" 
android:id="@+id/questionAdLayout" 
android:layout_height="fill_parent" android:minHeight="10dip"></LinearLayout>

然而，广告是贴在顶部而不是底部，我做错了什么

这是完整的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:id="@+id/questionLayout" android:layout_height="fill_parent"
    android:background="@drawable/stupid_bg_small">
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="The Stupid Test"
        android:textStyle="bold" android:textSize="20sp" android:textColor="#000000"
        android:padding="5dp" android:gravity="center_vertical|center_horizontal"
        android:layout_gravity="center_vertical|center_horizontal|center" />
    <LinearLayout android:layout_height="wrap_content"
        android:id="@+id/ProgressRow" android:layout_width="fill_parent"
        android:orientation="horizontal">
        <TextView android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:text="Progress"
            android:textSize="15sp" android:textColor="#111111"
            android:layout_weight="3" android:gravity="center_vertical|right"
            android:paddingRight="10dp" />
        <ProgressBar android:id="@+id/ProgressMeter"
            style="@android:style/Widget.ProgressBar.Horizontal"
            android:layout_width="fill_parent" android:layout_height="wrap_content"
            android:max="16" android:progress="-1" android:layout_weight="1"
            android:paddingRight="10dp" />
    </LinearLayout>
    <LinearLayout android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:orientation="horizontal">
        <TextView android:layout_width="wrap_content"
            android:gravity="top|center" android:layout_height="wrap_content"
            android:textSize="15sp" android:text="1" android:textStyle="bold"
            android:textColor="#000000" android:id="@+id/QuestionNumber"
            android:padding="10dp" />
        <TextView android:layout_width="fill_parent" android:id="@+id/QuestionText"
            android:layout_height="wrap_content" android:textSize="16sp"
            android:text="A truck driver goes down a one-way street the wrong way past several police officers. How does he avoid getting caught?"
            android:textStyle="bold" android:textColor="#000000" android:padding="10dp" />
    </LinearLayout>
    <ListView android:id="@+id/AnswerListView" android:background="@layout/roundcorder"
        android:layout_margin="10dp" android:minHeight="40px"
        android:choiceMode="singleChoice" android:cacheColorHint="@android:color/transparent"
        android:layout_width="fill_parent" android:layout_height="wrap_content" />
    <LinearLayout
    android:layout_gravity="bottom"
     android:layout_width="fill_parent" android:background="#FFF0F000"  android:id="@+id/questionAdLayout" 
        android:layout_height="fill_parent" android:minHeight="10dip"></LinearLayout>
    <LinearLayout android:layout_height="fill_parent" android:background="#FF00FF00"
        android:layout_gravity="bottom" android:minHeight="10dip"
        android:layout_width="fill_parent" />
</LinearLayout>

---

完整的布局图是什么样子的？你能把输出图的快照放下来吗

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:id="@+id/questionLayout" android:layout_height="fill_parent"
    android:background="@drawable/stupid_bg_small">
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="The Stupid Test"
        android:textStyle="bold" android:textSize="20sp" android:textColor="#000000"
        android:padding="5dp" android:gravity="center_vertical|center_horizontal"
        android:layout_gravity="center_vertical|center_horizontal|center" />
    <LinearLayout android:layout_height="wrap_content"
        android:id="@+id/ProgressRow" android:layout_width="fill_parent"
        android:orientation="horizontal">
        <TextView android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:text="Progress"
            android:textSize="15sp" android:textColor="#111111"
            android:layout_weight="3" android:gravity="center_vertical|right"
            android:paddingRight="10dp" />
        <ProgressBar android:id="@+id/ProgressMeter"
            style="@android:style/Widget.ProgressBar.Horizontal"
            android:layout_width="fill_parent" android:layout_height="wrap_content"
            android:max="16" android:progress="-1" android:layout_weight="1"
            android:paddingRight="10dp" />
    </LinearLayout>
    <LinearLayout android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:orientation="horizontal">
        <TextView android:layout_width="wrap_content"
            android:gravity="top|center" android:layout_height="wrap_content"
            android:textSize="15sp" android:text="1" android:textStyle="bold"
            android:textColor="#000000" android:id="@+id/QuestionNumber"
            android:padding="10dp" />
        <TextView android:layout_width="fill_parent" android:id="@+id/QuestionText"
            android:layout_height="wrap_content" android:textSize="16sp"
            android:text="A truck driver goes down a one-way street the wrong way past several police officers. How does he avoid getting caught?"
            android:textStyle="bold" android:textColor="#000000" android:padding="10dp" />
    </LinearLayout>
    <ListView android:id="@+id/AnswerListView" android:background="@layout/roundcorder"
        android:layout_margin="10dp" android:minHeight="40px"
        android:choiceMode="singleChoice" android:cacheColorHint="@android:color/transparent"
        android:layout_width="fill_parent" android:layout_height="wrap_content" />
    <LinearLayout
    android:layout_gravity="bottom"
     android:layout_width="fill_parent" android:background="#FFF0F000"  android:id="@+id/questionAdLayout" 
        android:layout_height="fill_parent" android:minHeight="10dip"></LinearLayout>
    <LinearLayout android:layout_height="fill_parent" android:background="#FF00FF00"
        android:layout_gravity="bottom" android:minHeight="10dip"
        android:layout_width="fill_parent" />
</LinearLayout>