有学者认为，徽商胡雪岩“垄断蚕丝，冀获暴利。此既为出口大宗，适光绪九年（1883年）外国丝市不振，洋商不购，而胡氏存货山积，悉归腐敝。由是尽丧其资，波及全国，钱庄分设各地者，纷纷倒闭，而胡氏一蹶不振。”在该学者看来，胡雪岩破产的主要原因是（    ）

如果函数$f\left(x\right)=x^2+bx+c$对于任意实数t，都有$f\left(2+t\right)=f\left(2-t\right)$，那么（   ）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Yesterday morning, I heard a piece of news which my friend Li Lei was admitted to the hospital because of the car accident. The day before yesterday, Li Lei is going to a bookstore to buy a book. He was very carefully when he got to the crossroads. He crossed the street when the traffic light turned to green. However, if he just went to the middle of the street, a car suddenly appeared at his right-hand side and came directly towards him. The driver drove fast and it was too late to avoiding it. Li Lei was knocked by the car. She was carried to the hospital immediately and had a surgery. Last night, I visited him. He looked pale unless he was out of danger.