题目

The police received a report that six men had stopped a truck and robbed the driver. It was ___1___ some goods and two bags   2  of something very important. The six men had gone   3   the police arrived. After __4___ for three hours the ___5___ found _6___ near the river. The driver was ___7___ on a bag in the truck and his   8    were tied   9  his back. The robbers had put a    10    into his mouth so that he couldn’t shout. The police got into the back of the truck and freed the    11   . They asked him    12   had happened. “I was stopped soon  13   �基因工程中需使用特定的限制酶切割目的基因和质粒，便于重组和筛选。已知限制酶Ⅰ的识别序列和切点是一G↓GATCC—,限制酶Ⅱ的识别序列和切点是一↓GATC—。根据图示判断下列操作正确的是A. 目的基因和质粒均用限制酶Ⅱ切割B. 目的基因和质粒均用限制酶Ⅰ切割C. 质粒用限制酶Ⅱ切割，目的基因用限制酶Ⅰ切割D. 质粒用限制酶Ⅰ切割，目的基因用限制酶Ⅱ切割