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第二节(共 5 小题;每小题 2 分,满分 10 分) 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两多余选项。 Some people put their bicycles away once they learn how to drive a car. For many people , bicycling is not just an easy way of getting around town but also an exciting sport. 36 . One kind of race is the time trial. Each racer leaves the starting line at a different time and heads hard for the finish line. The cyclist who covers the distance in the shortest amount of time wins the race. 37 , because the bicycles are spread out and are not likely to run into each other. Another kind of race is more difficult . A few city blocks are closed to traffic. Then all the racers line up in a tight pack and begin racing at the same time. 38 . The race requires more than speed. It also requires skillful handling of the bicycle as it run s at full speed around other bicycles. The racer who completes all the laps first is the winner. 39 . Racers have to cover anywhere from 35 miles to almost 3,000 miles. The race course may be a straight stretch of road or a long series of roads across the country. The prize goes to the first person who crosses the finish line. Between races cyclists stay in condition by doing exercise that builds their strength so that they can keep riding for long periods of time. 40 , they often join bicycling groups and become licensed racers. Then they can enter special races all over the country . If you ’ re a cyclist, keep practicing. You could become a star. A . As cyclists become more experienced
B.
. A time trial is a very safe race for beginners
C.
. Serious cyclists often arrange to take part in races
D.
. Road races are usually the longest cycling contests
E.
. Most people will seize possible chances to get around town
F.
. They cover many laps, going around and around the city blocks
G.
. When cyclists still need to build themselves up for those special races
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【简答题】下列有关蛋白质的叙述哪项是不正确的______。 (A)蛋白质分子的净电荷为零时的pH值是它的等电点 (B)盐对蛋白质会产生盐溶与盐析效应 (C)由于蛋白质在等电点时溶解度最大,所以沉淀蛋白质时应远离等电点 (D)变性蛋白质的溶解度减小
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【多选题】图是研究蒸发快慢与哪些因素有关的情景,下列说法中正确的是(  )
A.
甲图是研究蒸发快慢与温度高低关系的
B.
乙图是研究蒸发快慢与温度高低关系的
C.
丙图是研究蒸发快慢与液体表面附近空气流快慢关系的
D.
丙图是研究蒸发快慢与液体表面积大小关系的
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【单选题】如果次数分布中,各个标志值扩大为原来的2倍,各组次数都减小为原来的1/2,则算术平均数
A.
增加到原来的1/2
B.
稳定不变
C.
减小到原来的1/2
D.
扩大为原来的2倍
【单选题】如果次数分布中,各个标志值扩大为原来的 2 倍,各组次数都减小为原来的 1/2 ,则算术平均数
A.
增加到原来的 1/2
B.
减少到原来的 1/2
C.
扩大为原来的 2 倍
D.
稳定不变
【判断题】字符串是以’\n’为结束标志的一维字符数组。
A.
正确
B.
错误
【单选题】以下关于溶解度影响因素说法错误的是 。
A.
在等电点 pH 时,溶解度最小
B.
温度越高,溶解度也越高
C.
离子强度较高时,将降低蛋白质的溶解度,产生沉淀
D.
加入有机溶剂后,提高蛋白质分子内和分子间的静电作用力
【简答题】字符数组中存放的字符串是以 为结束标志的。
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