问题
单项选择题
种群是指生活在同一地点的同种生物的一群个体。种群中的个体通过繁殖将各自的基因传递给后代。下列叙述错误的是（）
A.自然选择使种群基因频率发生定向改变
B.种群基因频率的改变导致生物进化
C.种群通过个体的进化而进化
D.种群通过地理隔离可能达到生殖隔离
答案
参考答案：C
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种群是指生活在同一地点的同种生物的一群个体。种群中的个体通过繁殖将各自的基因传递给后代。下列叙述错误的是（）
A.自然选择使种群基因频率发生定向改变
B.种群基因频率的改变导致生物进化
C.种群通过个体的进化而进化
D.种群通过地理隔离可能达到生殖隔离
参考答案：C
Years ago in Scotland, the Clark family had a dream. Clark and his wife worked and saved, 21 plans for their nine children and themselves to 22 to the United States. It had taken years, but they had finally 23 enough money and had gotten passports and reservations for the 24 family on a new liner to the United States. The entire family was 25 with excitement about their new life. However, seven days before their 26 , the youngest son was bitten by a dog. The doctor sewed up the boy 27 hung a yellow sheet on the Clarks’ front door. 28 the possibility of rabies (狂犬病), they were being quarantined (隔离)for fourteen days. The family’s dreams were dashed. They would not be able to make the trip to America 29 they had planned. Watching the ship leave 30 his family, the father, filled with disappointment and anger, cursed both his son and God for their 31 . Five days later, the tragic news spread 32 Scotland---the mighty Titanic had sunk. The 33 ship had sunk, taking hundreds of lives with it. The Clark family 34 have been on that ship, but because the son had been bitten by a dog, they were left 35 in Scotland. When Mr. Clark heard the news, he hugged his son and thanked him for 36 the family. He thanked God 37 saving their lives and turning what he had left was a tragedy into a 38 . Although we may not 39 understand, all things happen for a 40 .
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