1. (10 points) In the forest, a competition is being held, and two animals need to be sent from among the lion, tiger, leopard, and elephant. If the lion is sent, then the tiger must also be sent; if the leopard is not sent, then the tiger cannot be sent; if the leopard participates, the elephant is unwilling to go. Therefore, the final participants in the competition are ( )
A. Lion, Tiger
B. Tiger, Leopard
C. Lion, Leopard
D. Tiger, Elephant
【Analysis】Through analysis, we can know:
From the problem: (1) If the lion goes, then the tiger goes, the contrapositive: If the tiger does not go, then the lion does not go,
(2) If the leopard is not sent, then the tiger is not sent, the contrapositive: If the tiger is sent, then the leopard must be sent,
(3) If the leopard is sent, the elephant is unwilling to go, the contrapositive: If the elephant goes, the leopard cannot be sent. From (2), we can see that the answer is $B$. Based on this, we can solve the problem.

【Solution】Solution: The problem requires two animals to go. We can use the assumption method. If the lion goes, then the tiger goes, and if the tiger goes, then the leopard also goes. Three animals going is a contradiction, so the lion does not go.

If the leopard does not go, then the tiger does not go, leaving only the elephant to go, which is a contradiction, so the leopard goes. If the leopard goes, then the elephant does not go. From the requirement that two animals go, we conclude that the tiger must go. Therefore, the answer is $B$, the leopard and the tiger go.

Hence, the choice is: $B$.