研究发现，水分进出细胞膜需要一种被称为“水通道”的蛋白质。若设法专一性地关闭肾小管壁细胞的水通道蛋白，则将导致离体的肾小管细胞（   ）

二月有多少天？1800年和1900年都是闰年吗？

某学生写了下面6个化学方程式．A、Al+O₂=AlO₂；B、4P+2O₂2P₂O₅；C、Cu₂（OH）₂CO₃CuO↓+H₂O+CO₂↑；D、4Fe+3O₂2Fe₂O₃；E、Zn+H₂SO₄=ZnSO₄+H₂；F、CuO+H₂=Cu↓+H₂O．

其中（请填序号）：

化学式写错的有化学式写错的有____；化学式正确但不符合质量守恒定律的有____；反应条件应该注明而未注明的有____； “↑”、“↓”使用不当或遗漏的有____．

完形填空
    This is an educational story．A teacher once told each of her students to bring an empty plastic bag and a large bag of 1 to school．If there was someone in their lives that they 2 to forgive，they chose a potato，  3  the name of that person and the date on it, and then put it  4 the plastic bag．Some of their bags were quite heavy．
    They were then told to5 these bags with them everywhere for one week，putting them beside their beds  6 and next to their desks in the classroom．
    As they carried the bags around with them，they 7 what a weight they were carrying，and how hard they needed to pay attention  8 ． Of course，the potatoes were rotten(腐烂的)soon，and smelled  9 ．
    This is the same as the price we pay for keeping our pain and unhappiness with us!So 10others is not only a gift for them，but also a very good gift for ourselves．

某同学设计了如图所示的发酵装置来制作果酒、果醋，下列有关叙述错误的是（    ）