保卫细胞的特点是[ ] A.靠气孔腔的外壁厚,背气孔腔的内壁薄 B.靠气孔腔的内 发布时间:2017-06-12 00:52 │ 来源:www.tikuol.com 题型:选择题 问题: 保卫细胞的特点是[ ]A.靠气孔腔的外壁厚,背气孔腔的内壁薄B.靠气孔腔的内壁厚,背气孔腔的外壁薄C.靠气孔腔的外壁薄,背气孔腔的内壁厚D.靠气孔腔的内壁薄,背气孔腔的外壁厚
题型:选择题 She doesn't know anyone here. She has got ______ to talk to.[ ]A. anyoneB. someone C. everyone D. no one 查看答案