题干

下列有关人体免疫的叙述中,错误的是(    )

A:人体皮肤和黏膜构成人体阻挡病原体和有毒物质的第一道防线,属于非特异性免疫

B:作为人体第二道防线的吞噬细胞不仅能直接吞噬侵入人体的病原体,同时也能将病原体的抗原信息传递给T细胞和B细胞

C:作为人体第三道防线之一的T淋巴细胞受抗原刺激后能增殖分化成记忆细胞和浆细胞,浆细胞通过分泌抗体来杀死病原体

D:记忆B细胞如果再次受到同种抗原刺激,则能引发机体的二次体液免疫,反应快且强

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C

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    Looking back at my younger years,I am sometimes amazed at how life has turned out.____The only thing that stays the same is who I am,my values,and my interests.If I could go back in time and hang out with my younger self for a day,here's what I would tell her.

    Everything happens for a reason.

    Without mistakes and failure,you would never have learned.Without pain,you would never have grown.Once you understand this,you will know that everything comes in to serve a purpose.So don't think that life is unfair, because everything happens for a reason.____

    Focus on one thing at a time.

    It is not surprising that many of us are doing too many things at once.We need to make ends meet.But if you are working three jobs at a time,it is not likely that you will succeed at any of them.You have to keep your eyes on the big picture.You have to ask yourself: What exactly do you want to achieve for the next 10 years?Focus on one thing at a time.____

    ____

    You might be graduating or have hit a turning point with your career.You might feel a bit lost and unsure of where to go.It's okay.Go out there and try as many different things as you can.Don't ever feel like you're wasting your time.Enjoy the journey.Every little path will lead you somewhere.And looking back,you will be able to connect the dots.It will all make sense.

    Don't try too hard with people.

    Don't worry if you feel like it's hard to make new friends.____It might take a while until you find new best friends and a mate for life,but when you do,you will know it.It's not hard work.So,just do your things and be yourself.

A. Achieve your goals one by one.

B. You can plan everything ahead.

C. Only time will tell what life will teach us.

D. Just be yourself and be as open as you can.

E. It's okay to be unsure about your purpose in life.

F. Nothing is exactly what I had originally planned for.

G. Don't worry too much about a decision you have to make.