问答题

There is supposed to be a safety ________ which makes it impossible for trains to derail.

答案：答案：There is supposed to be a safety mechanism which makes it...

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We wished to pay for welfare in a way that was less ________ on the poor without being massively destructive to the higher income groups.

答案：答案：burdensome 解析：在这个句子中，需要填入一个形容词来描述“支付福利的方式”，这个方式应该对穷人来说负担...

Lawren was well off and able to ________ painting as his favorite pastime.

答案：答案：afford 解析：根据句子的语境，Lawren有经济能力将绘画作为他最喜欢的消遣方式。因此，空缺处应填入一个动...