题目内容

深度学习一般使用_________激活函数来实现多分类。

A. Sigmoid
B. Tanh
C. ReLU
D. Softmax

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About twenty of us schoolchildren had been fortunate enough to receive invitations to a film-studio(电影摄影棚)to take part in a crowd-scene. Although our "act" would only last(1)___ for three minutes,we were given the opportunity to see quite a number of interesting things. Soon after we arrived,bright lights were turmed on. Since it was very hot in the studio,it came as asurprise(2)____ to us to see one of the actors put on a heavy overcoat. He (3)___ down over his eyes, put his hands in his pockets,and started walking along a winding path. A big fan began blowing(4)_____ small white feathers down on him,and soon the bare trees were covered in "snow".Two more fans were turned on,and a "strong wind" whistled through the trees. The first actor was dragging through the snow when the second, dressed (5)____ as a beggar,began walking towards him trem-bling with cold.The next(6)_____was a complete contrast.The way it was filmed was quite(7 )______. Pictures taken on an island in the Indian Ocean were shown on a glass screen. An actor and an actress stood in front of the(8) ______so that they looked as if they were at the water,s edge on the island.Since it was orn (9)_____ turn,we were left wondering what scence would be prepared for us. For the full three mintues in our lives we would be experience the (10)______ of the film "stars”!A. extraordinary B.image C. excitement D.instructions E. sceneF. dressed G.shaking H. extroordinary I.surprise J.blowingK.last L.pulled M. sequence N.anticipate O.turn

基因突变的本质是由()

A. 碱基变化引起
B. 物理因素
C. 化学因素
D. 生物因素

下列现象中属于可遗传的变异的是( )

A. 玉米由于水肥充足而长得穗大粒足
B. 人由于晒太阳皮肤变黑
C. 无籽番茄没有种子
D. 人类的色盲病

下列有关基因突变的说法,不正确的是( )

A. 自然条件下,一种生物的突变率是很低的
B. 生物所发生的基因突变一般都是有利的
C. 基因突变在自然界的中广泛存在
D. 基因突变可产生新的基因,是生物变异的主要来源

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