题干

有关高等生物体内细胞及其生命活动的叙述错误的是(  )

A:细胞分裂、分化、凋亡和癌变均与基因有关

B:细胞分化后,细胞种类增多,但每个细胞的全能性降低

C:癌变细胞内酶的活性降低,从而导致细胞代谢缓慢

D:细胞被外力损伤而死亡的过程属于细胞凋亡

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答案(点此获取答案解析)

C,D

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Throughout the history of the arts, thenature of creativity has remained constant to artists.Nomatter what objects they select, artists are to bring forth new forces andforms that cause change---to find poetry where no one has ever seen orexperienced it before.

Landscape (风景) isanother unchanging element of art.It can be found from ancient timesthrough the17th-century Dutch painters to the 19th-century romanticists andimpressionists.Inthe 1970s Alfred Leslie, one of the new American realists, continued thispractice.Lesliesought out the same place where ThomasCole, a romanticist, had producedpaintings of the same scene a century and a half before.UnlikeCole who insists on a feeling of loneliness and the idea of finding peace innature, Leslie paints what he actually sees.In his paintings, there is no particularchange in emotion, and he includes ordinary things like the highway in thebackground.Healso takes advantage of the latest developments of color photography to helpboth the eye and the memory when he improves his painting back in his workroom.

Besides, all art begs the age-oldquestion: What is real? Each generation of artists has shown theirunderstanding of reality in one form or another.The impressionists saw reality in briefemotional effects, the realists in everyday subjects and in forest scenes, andthe Cro-Magnon cave people in their naturalistic drawings of the animals in theancient forests.Tosum up, understanding reality is a necessary struggle for artists of allperiods.

Over thousands of years the function ofthe arts has remained relatively constant.Past or present, Eastern or Western, thearts are a basic part of our immediate experience.Many and different are the faces ofart,and together they express the basic need and hope of human beings.