图中示意我国四川西部某山地东坡土壤中磷累积量的垂直变化，磷高累积区是（    ）

不定方程$x^2-2y^2=5$的正整数解$\left(x,y\right)$的组数是（  ）

（a^xa^y）¹⁰=a²⁰（ a＞0，且 a≠0），则 x、y 的关系是（   ）

一列火车有16节旅客车厢，每节车厢可乘坐118名乘客．这列火车一共可以乘坐____乘客？

阅读理解
    Different weather makes people feel different．It influences health，intelligence and feelings．
    In August，it is very hot and wet in the south the US．People there have heart trouble and other kinds of health problems during this month．In the Northeast and the Middle West，it is very hot in the summer and very cold in the winter．People in these states have more heart trouble after the weather changes in February or March．
    The weather can also influence intelligence ． For example，in a 1983report by scientists，IQ(智商)of a group of students was very high when a very strong wind came, but after the strong wind,
    Their IQ was 10% lower than before. The wind can help people have higher intelligence. However,very hot weather can make it lower. Students in many schools of the US often get worse in exams(考试)in the hot months of the year(July and August).
    Weather also has a strong influence on people's feelings．Winter may be a bad time for thin people．They usually feel cold during these months．They might feel unhappy during cold weather．But fat people may have a hard time in hot summer．At about 18℃people become stronger．Low air pressure may make people forgetful．People leave more bags on buses and in shops on low-pressure days．
    Are you feeling sad，tired，forgetful，or unhappy today？It may be the weather's problem．