心脏的瓣膜只能向一个方向打开,这就保证了心脏内血液的流动方向只能是( )
A:心室→心房→动脉
B:心室→心房→静脉
C:心房→心室→动脉
D:心房→心室→静脉
I have a beautiful cat. ____ name is Mimi. These cakes are ____. (it)
I am a middle-school student. Now let 1 tell you something 2 our classroom. It's very 3 There are two maps4 the back wall. 5is a map of China.6 is a map of the world (世界).There are7 desks and chairs in our classroom. There is a big desk 8 theteacher in the front of it. We 9 four classes in the 10 and two in the afternoon
课外文言文阅读,回答相关问题。 郑人逃暑 郑人有逃暑①于孤林②之下者,日流影移,而徒衽③以从阴。及至暮,反席于树下。及月流影移,复徒衽以从阴,而患露之濡④于身。其阴逾⑤去,而其身逾湿,是巧于用昼而拙于用夕矣。 【注释】:①逃暑:避暑,乘凉。②孤林:独立的一棵树。③衽(rěn):卧席。④濡(rú):沾湿。⑤逾:同“愈”,更加。
多音字组词
漂:piào____、piāo____、piǎo____
称:chèn____、chēng____
撒:sā____、sǎ____
挣:zhèng____、zhēng____
某生物兴趣小组为探究果实在发育过程中的体积变化,选择了两朵黄瓜雌花,坚持每天定时测量果实的体积,并绘制了果实体积变化曲线如图所示.请据图回答:
(1)在曲线a中,幼果体积增大是花的____ 迅速发育的结果,在此过程中____ 一般都逐渐凋落.
(2)当黄瓜体积达到A点时,将它剖开发现有很多粒种子,这是因为子房里生有____.
(3)曲线b的原因是____ .
(4)在大棚里种植黄瓜时,为避免出现曲线b的现象,可以采取____ 的措施.