区块链+分布式文件系统两者结合，可以开发任意的中心化应用。()
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智能合约作为存储于区块链上的一段代码，可在用户调用下执行相关操作并改变区块链网络中的用户状态。（）
A. 对
B. 错
Parts of my childhood are so ______ to me that they could be memories of yesterday.
A. tedious
B. vivid
C. formal
D. severe
As a sailing ship has a ______, so we must have a definite goal in our life.
A. reference
B. sequence
C. destination
D. reunion
Jane’s worried she won’t be able to ______ her paper on time.
A. take hold
B. turn in
C. hold back
D. face up to
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