单选题 When the author says that observers are waiting for the dominoes to start falling, he means ______.

A、 observers are taking a wait- and- see attitude towards the future of euthanasia
B、 similar bills are likely to be passed in the US, Canada and other countries
C、 observers are waiting to see the result of the game of dominoes
D、 the effect - taking process of the passed bill may finally come to a stop

【正确答案】 B

【答案解析】[详细解答] 我们知道，多米诺骨牌游戏的特点是头一张牌倒下，必然导致后面许多牌一个接一个相继迅速倒下。在此，作者借此暗示类似法案的相继通过。这与选项[B]“美国、加拿大和其他国家可能会通过类似法案”的意思一致，故为正确答案。