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在下列各句中,划线的成语使用不恰当的一项是( )
2017年5月14日,“一带一路”国际合作高峰论坛在北京拉开帷幕。各国代表共商合作大计,共建合作平台,共享合作成果。其中的“一带”是指“丝绸之路经济带”。在古代,丝绸之路是( )
根据短文内容判断下列句子的正误。
A
Baseball isone of the most popular sports in the USA. Each team has nine players. The baseball season goes from April to September. The members of the important baseball teams become heroes (英雄). At the end of the season, the two top teams play together. Lots of baseball fans go to watch the games. There are also thousands of baseball fans listening to the radio or watching TV. People always talk about the games. They still talk about the results (结果) and the players, even if (即使) the games are over. American football is more popular than baseball in the USA. When the baseball season ends, the football season begins. When there is an important American football game, millions of people sit in front of the TV set to watchit. Many people even sit beside the radio to hear the result when they are working.
桦树林中出现了一些云杉的幼苗,云杉长大后,其高度超过桦树,桦树因不耐阴而逐渐死亡,桦树林最终被云杉取代.这一变化过程表明( )
下列各种现象与其应用的物理知识之间的关系中,正确的是( )