下图是突触的亚显微结构模式图。现在B处施加电剌激，使其兴奋。受到剌激后，B处膜内外电位变化及其所产生的神经冲动的传导方向是（ ） A．
Jack, ______ your coat. It’s very cold today. A. put on B. take off C. put up
It is hard for me to imagine what I would be doing today if I ____ in love, at the age of seven, with the Melinda Cox Library in my hometown. A. wouldn’t have fallen B.
阅读下面的文字，完成后面问题。 《说文》云:“牍,书版也。”所说的牍即指“尺牍”,是古代作为书写工具的木版,当时的牍通常长一尺,因而名之。 “
The population of Wellington ____343,000, most of ____like water sports.A. is ;who B are ;who C. is; whom D. are ; them.
通过优化重组，我国诞生了一批具有国际竞争力的明星公司企业，如海尔、长虹、宝钢，它们通过技术进步、开发新产品、加强管理，取得了令人瞩目
直角三角形两直角边边长分别为6cm和8cm，则连接这两条直角边中点的线段长为( ) A．10cm B．3cm C．4cm D．5cm
—Can you guess ______ the new schoolbag yesterday? —Sorry, I’ve no idea. A. how much did he pay for B. how much he spent C. how much he paid for
