物象在低倍镜（10×）下清晰可见，换高倍镜（40×）后看不见了，这是因为（）。

[单选题]Passage 1    The World Cup has become the most streamed live sporting event the US has ever seen, as Americans tuned in to this year's tournament on their smart phones, tablets and computers in record numbers.    A of US interest in football this year has also led to record television audiences for broadcasts on ESPN and Uni-vision, the Spanish-language network. The US team's loss on Tuesday to Belgium averaged a 9.6 0vernight rating on ESPN, according to Nielsen, the highest for any World Cup match the network has broadcast.    But a 50 per cent surge in live streaming compared with the previous record, set during the 2012 London Olympics, shows that the sport's appeal has grown particularly among younger, more digital, fans. Young people are energetic and fond of sporting. The World Cup is a great tournament of football, so they must be attractive. On the other hand, now the electronic devices are developing rapidly, more people have smart phones, tablets and computers. Then to watch the World Cup becomes much easier.US viewers have so far watched nearly 30m hours of streaming video on ESPN's World Cup website and apps, the network said, beating the previous record of 20.4m viewing hours during NBC's 2012 0lympics coverage. Univision has streamed l.5m hours since the start of the tournament.    Last week's USA vs. Germany match drew a record 1.7m streaming viewers to ESPN at its peak, with streaming on Univision peaking at 747,000. Tuesday's USA vs. Belgium match peaked at 1.5m streams on ESPN and 680,000 On Univision.    In comparison, live streaming of January's Super Bowl peaked at 1.1m.    While the elimination of the US team leaves a question mark over US fans' interest in the rest of the tournament, Univision's audience for non-US games has been robust.    Univision said its broadcast on Sunday of the Mexico vs. Netherlands match was the most-watched programme, of any kind, in US Spanish-language TV history, with an average 10.4m viewers. Its audiences have been the largest in cities with large Spanish-speaking populations, such as Miami, Los Angeles, Houston and New York.    With most matches being shown during business hours, Americans are increasingly turning to their devices, such as smart phones, tablets and computers to keep up with the tournament. Fifa, football's governing body, said US fans make up 20 percent of its global digital audience and are spending more time on its website and apps than fans in Brazil, Germany, England and France combined.    With different kind of electronic devices to watch World Cup, the number of audience becomes larger. The flood of demand caused some problems with ESPN's feeds, leading frustrated viewers to take to Twitter to complain about the match cutting out. That had also happened during the USA vs. Germany game.The best title of the passage may be ______.

[单选题]长期趋势、季节变动、循环变动和不规则变动是时间序列的四种构成成分。根据乘法模型，要测定某种成分的变动，只须从原时间序列中（　　）。[2016年初级真题]

[判断题]猩红热的传染源主要是病人和带菌者。

[单选题]生脉散与四君子汤的组成中均含有药物是（　　）。

[单选题]关于脑膜炎球菌的特性，下列哪项是正确的（）.

[单选题]高技术战争是大量运用信息技术、新材料技术、新能源技术、生物技术、航天技术、海洋技术等当代高新技术的常规武器装备，并采用相应的作战方法进行的战争（）。

[判断题]基本呼叫状态模型BCSM实现的功能是BCP SIB。

[填空题]武侠小说的创作在中国文学史上一直延绵不断，1923年1月平江不肖生的（）则被公认为是现代武侠小说的开端。

[多选题]李东收到银行转账汇票后，应审查（）

[填空题]申请食品添加剂生产许可需提交与申请生产许可的食品添加剂相适应的生产设备、设施的（）证明材料及清单。