【题目】The river ________ at least 50 meters in width, but the ten-year-old boy can swim across it within minutes.
A.is measuredB.measures
C.is measuringD.is being measured
在线课程【答案】B
【解析】
考查时态。句意：这条河的宽度至少有50米，但10岁的小男孩可以在几分钟内游过。此处measure（测量，估量）是不及物动词。这里讲的是一个事实，句子用一般现在时态，主语是The river，是单数第三人称，故答案为B。