#include<stdio.h>
#define MAX 1000009
typedef long long ll;
ll parent[MAX];
ll rank[MAX];
ll find(ll a)
{
	while(a!=parent[a])
		a=parent[a];
	return a;
}
void uni(ll a,ll b)
{
	a=find(a);
	b=find(b);
	if(rank[a]==rank[b])
	{
		parent[a]=b;
		rank[b]++;
	}
	else if(rank[a]>rank[b])
		parent[b]=a;
	else
		parent[a]=b;
}
void set_zero()
{
	for(int i=0;i<MAX;i++)
		parent[i]=i,rank[i]=0;
}
int main()
{
	ll test,n,c,a,b,q;
	scanf("%lld",&test);
	while(test--)
	{
		set_zero();
		scanf("%lld%lld",&n,&c);
		while(c--)
		{
			scanf("%lld%lld",&a,&b);
			uni(a,b);
		}
		scanf("%lld",&q);
		while(q--)
		{
			scanf("%lld%lld",&a,&b);
			if(find(a)==find(b))
				printf("Yes\n");
			else
				printf("No\n");
		}
	}
	return 0;
}

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MQo3IDUKMSAyCjEgNQoxIDQKMiA0CjYgNwo1CjEgNAoyIDMKNiA3CjcgNAo1IDQKCg==

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