Passage 1
The IMF believes that economic growth is picking up,sounds familiar.
April is the cruelest month,breeding lilacs out of the dead land,and,in Washington,chirpy forecasts from the IMF that often prove a bit too chirpy.On April 18th the fund released its semi-annual World Economic Outlook（WEO）,raising its forecast for global growth in 2017 to 3.5%.Growth forecasts for the emerging world have not changed.The IMF's global optimism is based instead on hopes of increased growth in the rich world.
The fund takes a rosy view of the American economy,citing both high levels of consumer confidence and Donald Trump's plans for more government spending.
In Britain the IMF now reckons GDP will grow by 2.0%in 2017,up from earlier estimates of 1.5%（issued in January）and 1.1%（last October）.The IMF has also raised its forecasts for Japan and the euro area.
Snipers point out that IMF forecasts have been far from perfect.Some glitches are excusable.In the spring of 1990,it predicted that Kuwait's economy would grow by 0.8%that year.It actually fell by 26%.
According to the passage,the estimate of the IMF on Britain’s GDP has been increased（ ）this year.
根据题干中的关键词Britain’s GDP定位至第四段，可知今年的预测从一月份的1.5%增长到了2%，因此今年的预测数值增长了0.5%。故正确答案是选项A。
下列关于公司的表述，正确的是（）
以下各项列举了我国常见气象灾害与其发生地区的对应关系，其中正确的一项是（）
根据电视收视率调査，看体育节目的观众中青年人比中老年人要多。
由此可推断出（）
—种海洋蜗牛产生的毒素含有多种蛋白，把其中的一种给老鼠注射后，会使有两星期大或更小的老鼠陷入睡眠状态，而使大一点的老鼠躲藏起来。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是呆住，而较大的那些老鼠会逃跑。
以上陈述的事实最有力地支持了以下哪项假说？（）
疾病控制中心对某校髙中三个年级的学生进行抽样做视力状况调查，抽样的方法为分层抽样（按比例抽样），若高中一、二、三年级学生人数分别为626、703、780，样本容量为84，则应从离二年级抽样的学生人数为多少？（）
