足月新生儿出生时存在,以后也不消失的反射是()A.觅食反射 B.角膜反射 C.握持反 发布时间:2017-05-21 15:53 │ 来源:www.tikuol.com 题型:单项选择题 问题: 足月新生儿出生时存在,以后也不消失的反射是()A.觅食反射B.角膜反射C.握持反射D.颈肢反射E.腹壁反射
题型:单项选择题 Currently 94%of Web users use either Internet Explorer or Firefox.but recently somenew (71) have been developed that are beginning to attract attention.The browser Opera isbecoming very (72) because of its speed,it is currently the world’S fastest browsec andbecause it is much smaller (73) existing browsers(it can almost fit on a single diskette).It canalso (74) the last web page you visited,so the next time you surf,you can start where you leftoff.And like the big two,you can get it for free;the catch is that you have to watch blinkingads in one comeL orpay$40 forthe ad—free (75) ofOpera.A.think B.read C.write D.remember 查看答案
题型:单项选择题 如图为叶片的横切面结构示意图,请据图回答:(1)叶片的基本结构包括1和5______、2______、4______.(2)图中的6是______,它是由两个______围成的.它是植物体______的门户,也是植物与外界进行______交换的窗口,它主要分布在叶片的______.(3)2与4相比,2具有______和______的特点,所以,叶片的______表面看起来颜色要深一些,并且在叶片落地时,一般______面朝上.2和4构成的组织属于______组织.(4)在图中,不能进行光合作用的是______的细胞(填数码). 查看答案