推荐回答（4个）
选C，“自南向北流，西岸冲刷严重”，用笔划一下，河流是向左侧偏的，根据自转偏向力“南左北右”的原理，可知该区域位于南半球。
“北京时间18:50，当地影子为一点”说明当地处于正午，而且是太阳直射（即位于南北回归线之间），即当地时间为12点，与北京相差6:50按照15度/时，可算出相差102.5度，当地时间又比北京时间晚，即在120度经线以西，120-102.5=7.5度，当地经度为东经7.5度。东西半球分界线为西经20度，东经160度，该地属于东半球。
答案A应为南半球、东半球
答案B地中海在北半球
答案C由于当地属于热带（南北回归线之间）有可能出现热带荒漠
答案D东北风向在北半球
来算算吧~ 北京时间18:50分也就是东经120°时间为18:50分时 此地方的地方时让影子缩成一个点表示是当地时间的正午12点，二者相差6小时50分的时差，折合经度1°为4分钟的原理，相差6小时50分（为410分钟）可以算出它们经度差为102.5°，由于北京比当地早6小时50分 表示此地在东经120°以西，因此可算出当地的经度为东经17.5°。
由题信息：河流自南向北流，且西岸冲刷严重，根据地转偏向力的分析，北半球地转偏向力是向右，南半球地转偏向力向左，而上题所说河流自南向北流且冲刷西岸，也就是冲刷河流的左岸，因此得出，该地在南半球。
再来分析，题目提示，地方旗杆的影子缩成一个点，表示该地一年以内能呗太阳直射到也就是南北纬23°26′之间。
上述这么多推理出来的信息可以判断：A，是错误的， B 地中海沿岸，地中海的维度在北纬30~45°之间，因此是错误的。D：盛行东北风，该地的处于两回归线之间，是盛行信风，处于南半球，盛行的应该是东南信风，所以是错的 正确答案为C ，纯手工回答 还望采纳~希望对你有帮助
由于受地转偏向力影响，地球上的物体遵循北半球向右偏，南半球向左偏的规律，河流流向自南向北西岸冲涮严重，说明它冲刷的是左岸，因此该地位于南半球，后文提到旗杆影子缩为一点，这就表明太阳能够直射到这个地方，这个地方的纬度范围为0°-20°26′S之间；北京时间18点50分该地旗杆英姿变成一点，说明这个时候当地地方时为正午12点，北京时间以东经120°来算的，这就需要计算12点时的那个地方在哪里，这个就不需要详细计算了吧，这个地方的经度为17°30′E，由此可以看出答案选C，该河流为尼罗河
选C，北京时间18:50时当地为12:00，影子为点就是说阳光直射，那就是在北回归线南，自南向北的河流可能是尼罗河，那里是热带沙漠
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