当我更改单个Mat-select时，所有mat-select值都会更改

data1 = ['Option 1', 'Option 2', 'Option 3'];
data2 = ['Choice A', 'Choice B', 'Choice C'];

<mat-form-field>
  <mat-label>First Mat-select</mat-label>
  <mat-select [(ngModel)]="selectedOption1">
    <mat-option *ngFor="let option of data1" [value]="option">{{ option }}</mat-option>
  </mat-select>
</mat-form-field>

<mat-form-field>
  <mat-label>Second Mat-select</mat-label>
  <mat-select [(ngModel)]="selectedOption2">
    <mat-option *ngFor="let option of data2" [value]="option">{{ option }}</mat-option>
  </mat-select>
</mat-form-field>