问题
单项选择题
面粉的“熟化”是指面粉在贮存期间，空气的氧气自动氧化面粉中的色素，并使面粉中的还原性氢团转化为双硫键，从而使面粉（），面粉的物理性能得到改善。
A、色泽变暗
B、色泽变白
C、潮湿
D、干燥
答案
参考答案：B
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面粉的“熟化”是指面粉在贮存期间，空气的氧气自动氧化面粉中的色素，并使面粉中的还原性氢团转化为双硫键，从而使面粉（），面粉的物理性能得到改善。
A、色泽变暗
B、色泽变白
C、潮湿
D、干燥
参考答案：B
It was one of those cold winter nights in the Haight-Ashbury district of San Francisco . I was driving an eyesore（丑陋的东西）that could only be 36 as a “ car ” by someone who was either a shameless liar or a good friend . It was 37 to drive the car because you had to keep your fingers and toes crossed to keep the engine running . I tried to imagine I was driving a huge clumsy 38 ; that way I didn’t 39 the slow speed . That night I must have uncrossed my fingers to scratch something . The car 40 in the middle of a four-lane stretch of Oak Street . I 41 for a place to turn off（拐弯）, but the street was lined with parked cars . There I sat , in 42 traffic , as tons of vehicles screamed by . In my rearview mirror（后视镜）I saw a car 43 behind me . I knew what was coming . Soon the horn would start and someone would be 44 at me . But I was 45 . A stranger got out of the car and came to my 46 . He asked , “ Do you want a 47 ?” I was surprised but 48 . And then he 49 to his car and two teens piled out to help push my car . When I was 50 delivered to a side street , they got back into their car and rejoined the sea of 51 . I didn’t get to 52 them . Over the years I’ve realized something about the 53 who stopped to help . I’ve noticed that every time I’m in 54 , he appears . The one true thing in this world is an unasked 55 provided by a stranger .
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