用压强计“探究影响液体内部压强大小的因素”；

 

①如图所示压强计是通过U形管中液面的____来反映被测压强大小的．使用前应检查装置是否漏气，方法是用手轻轻按压几下橡皮膜，如果U形管中的液体能灵活升降，则说明装置____（选填“漏气”或“不漏气”）。

②如图甲、乙、丙、表示探究过程中的三个情景．容器中的液体、金属盒插入的深度以及U形管中液面情况，都可以从图上看出．比较图____可知液体压强大小与深度有关；比较图____可知液体压强大小还与液体的密度有关。

阅读理解A
    I'm Linda．I can't find my keys．I lost them this morning．There is a Lost and Found box in our classroom．My keys may (可能)be in the box．
    Oh, there are many things in the box．This is a pencil box．What color is it? It's yellow．That is a white eraser．And what's that? It is a watch．A picture of a CD is on it．It's Sara's．Wow! I find my keys．One is to my classroom，and the other (另一个)is to my house．That green cup is Jack's．This baseball is his，too．I will(将)ask him to take his things．Three rulers, two pencils and two nice pens are also in the box．Whose are they? I don't know．
根据材料内容判断正误。

甲经营水果，乙为甲做果箱。甲为了薄利多销便以较低价格出售水果，这不但使得甲的水果生意火红，而且乙的果箱也供不应求。这说明(   )

正常情况下，基因型为RRX^TX^T的果蝇体内，存在4个R基因的细胞为（    ）

阅读下文，回答问题

    公园里四季都有花。春天有粉红的桃花，夏天有雪白的莲花，秋天有金黄的菊花，冬天有淡黄的蜡梅，五颜六色，好看极了！