患者，高烧5天，可疑败血症，医嘱作血培养，其目的是（） A.查血中白细胞数量 B

根据短文内容填入适当的单词，使短文的意思完整，每格限写一个单词，要求首字母与所给的字母

相同，要求写出完整的单词。

     David goes to school in New Zealand. When he was at primary school, he didn't have any (1)h______

to do. He only had to read for 15 minutes very evening: that's all! His school had a huge sports field that was

(2)b______ enough for four football fields. He loved to run around with his (3)f______. His teacher was nice,

too. Sometimes she would say, "(4)S______ your maths work please, children. It's a beautiful day outside.

Let's go out and play a (5)g______!" 　　

     Things have changed since David started high school. He still (6)p______ a lot of sports, but the work is

a bit harder. He has to do some homework, but not too much, only one hour each night. 　　

     But the (7)b______ thing David loves about his high school is all the sports he can play. The sports ground

has a running track, (8)a______ s pool and four football fields. David plays sports every day after school. 　　

     David is looking forward to (9)g______ to university. After he has finished his studies, he wants to

(10)t______ around the world. He dreams and hopes that day he can.

在某一温度下，两个电路元件A和B中的电流与电压的关系如图所示。

（1）由图可知，元件_____中的电流与它两端的电压之间的关系遵循欧姆定律；

（2）将A和B并联后接在电压为2.0V的电源两端，求元件A的电功率及通过A和B的总电流。

有A、B、C、D四种化合物，A是硝酸盐，B是酸，C是碱，D是氯化物，它们能够发生以下反应：（1）A、B的溶液混合后，出现难溶于稀硝酸的白色沉淀；（2）C、D的溶液混合后，得到蓝色沉淀和食盐溶液；（3）A和D混合后无明显现象．则A、B、C、D四种物质的化学式分别为：A．______；B．______；c．______；D．______．

（）为黄曲条跳甲危害萝卜的特点。

A.成虫、幼虫都危害

B.叶面空洞

C.子叶被害，整株枯死

D.幼虫危害肉质根

“雨水”属于( )季的节气。

A．春
B．夏
C．秋
D．冬