题干

如图是3种氨基酸的结构式,由这3种氨基酸按顺序脱水缩合所形成的化合物中,含有的氨基、羧基和肽键的数目依次是(    )

A:1,2,3

B:1,1,3

C:1,2,2

D:2,2,2

上一题 下一题 0.0难度 选择题 更新时间:2016-01-04 05:02:00

答案(点此获取答案解析)

C

同类题1

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。选项中有两项为多余选项。

        The relationship between parents and teachers is important in the development of a child. The good communication between them is communication that says, “I care about my child, and I value school. ” The best way a parent can show how much he or she values learning is by sending a prepared child to school everyday.  ____Once a child gets behind in class, catching up can be difficult.

        Parents and teachers are partners in student development. A school community is built on relationships established among children, teachers and children's families.

        Here are tips for creating a positive relationship with your child's teacher.

        Meet with your child's teacher in the fall.____—his or her special needs, outside activities, health, and home study habits.

        Look for the positive.____ Share with your child's teacher something you particularly appreciated regarding the teacher's role in the academic and/or social development of your child.

        Letthe teacher know that you want to support the work that is being done in class.Ask for suggestions for expanding school activities into home activities.

____   You can send a note of  thanks when something special takes place in the classroom and your child is involved.

Bewilling to participate in or set up a conference when you or your child's teacher feels a special meeting is needed, such as...

·____

·Your child seems to be deeply upset about something that happened at school.

A.When a child is absent from school,important lessons may be missed.

B.Phone your child's teacher ifnecessary.

C.The teachers need to feel appreciatedfor the job they do.

D.This is a good time for the teacher tolearn more about your child.

E.Express your appreciation to theteacher.

F.The beginning of every term is veryimportant.

G.There is a dramatic drop in yourchild's grades.