A:获能后的精子与卵子相遇后,释放顶体酶穿过透明带进入放射冠
B:透明带反应是防止多精入卵的第一道屏障
C:精子与卵黄膜相互融合,精子入卵
D:雄原核形成的同时,卵子完成第二次减数分裂
____ We make (玩具)in the factory for children from 1 to 5 years old.____ Mr. Wang enjoys r newspapers in the morning.____ He is a police man .It's a (危险的) job.____ I think giraffes are good-looking, but lions are u__________ .____ There is much ________ (雨)here in summer.____ My mother is l_________ on the beach.____ What s_________ skirt would Joe like?____ He is from France. He speaks F________ . ____ The park near my home is very d_________(脏), I don't like to go there.____ There are three (小偷)in the police station.
可视农业是“互联网+农业”中的一种特色农业电子商务模式,消费者可以通过互联网免费观看动植物的整个养殖、种植过程,了解和监督生产活动。由此可见“互联网+”( )
①日益渗透到社会生产生活 ②是促进农产品销售的核心渠道
③对人类的文明进步起决定性作用 ④极大地推动了社会的进步