题干

利用细菌大量生产人的胰岛素,下列叙述错误的是(   )

A:用适当的酶对运载体与人的胰岛素基因进行切割与黏合

B:用适当的化学物质处理受体细菌表面,将重组DNA导入受体细菌

C:通常通过检测目的基因产物来检测重组DNA是否已导入受体细菌

D:重组DNA必须能在受体细菌内进行复制与转录,并合成人的胰岛素

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C

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    There is no doubt that the first day of school can be crazy for most of students. New kids wander (徘) around in circles, waiting for the opening of the school door. The school nurse needs your medical records. ____ The freshmen are running in all directions, looking for their new classrooms.

    How can you overcome the first-day chaos? If you will go to a new school, try to arrange a visit before classes begin. Explore any areas, such as the playground, library, or school labs.____

    Get one and read it before your school, starts-then keep it in your school bag until you're familiar with your new surroundings. Your first day is also the time to bring in school supplies and books.

    You should arrange your schoolbag well the night before you go to school so that you won't look for what you need at the last minute.

    Did you try on eight different coats before deciding on what to wear?____ The best choice is to wear what makes you feel good, whether it is a new coat or an old sweater. If you plan to wear a pair of shoes, make sure they fit you well.

    ____ Some start with a gathering, while others may jump right into the first-period class. You'll meet your new teachers, and they will probably give you an overview of the courses, class rules, what the semester will be like, what supplies you'll need, and expectations of your performance and behavior. Some teachers will jump into their first lesson, while others may have some activities.____

A. Some schools even offer maps.

B. But you forget to bring it with you.

C. It all depends on the class and teacher.

D. Don't depend on your parents any more.

E. Each school has different opening-days.

F. You can also try to ask the teachers for help.

G. Lots of students have difficulty deciding on what to wear on the first day of school.