什么是一次性培养、连续培养、半连续培养？

阅读理解。

Mr. and Mrs. Brown have two children, Mike and Liz. The whole family are all busy, so they often leave notes (便条) for each other. Read these four notes of today and answer the following questions. ① 3:30 pm To Mike, Mr. Tyler rang. No football practice today. I'm going to Donna's house to play and be back at 5:00 pm Liz ② 4:00 pm To Liz,      It's your turn to walk the dog. I have to do my homework after school. Remember to play with Teddy when you get home! Mike ③ 6:45 pm Has anyone seen my tennis shoes? I'm in my bedroom doing my homework. Mike ④9:00 pm      I saw your shoes this morning. They smelt terrible so I put them outside the back door. Good night, dears! Mum

1. When will Liz be back home?

A. At 3:30 pm. B. At 4:00 pm. C. At 5:00 pm. D. At 9:00 pm.

2. Who should walk the dog today?

A. Mike. B. Mrs. Brown. C. Liz. D. Mr. Brown.

3. What is Mike doing at 6:50 pm?

A. Practicing football. B. Going to Donna's house. C. Playing tennis. D. Doing his homework.

4. Where can Mike find his tennis shoes?

A. In his bedroom. B. Outside the back door. C. In the living room. D. At Donna's house.

5. According to the notes, Teddy is __________.

A. Mike's mother B. Mike's brother C. Mike's football couch D. the dog in the family

直接写得数． 4 27 + 5 27 = 5 8 - 1 8 = 9 10 + 9 10 = 0.7×8= 0.56÷1.4= 7.5×0.2= 0.56÷1.4= 20.5÷0.5= 5÷25= 0.2×0.4= 2÷0.5= 2.6+2.4×2=

光接收灵敏度是指在一定的误码率指标下光接收机可接收的（）光功率，通常用Pr表示。

为了研究滑动摩擦力的大小跟哪些因素有关，小明同学在老师的指导下做了一系列实验．以下是部分实验步骤（实验过程中保持长木板水平且固定）．（取g=10N/kg）

第一次：把木块平放在长木板上，用弹簧测力计水平拉动木块，使木块做匀速直线运动（如图甲），读出弹簧测力计的示数，并记入下表中；

实验次数	木块对木板的压力/N	弹簧测力计的示数/N	滑动摩擦力/N
1		4.0	4.0
2	20	4.0
3		8.0

第二次：把木块侧放在长木板上，用同样的方法拉木块（如图乙），记下相应的示数；

第三次：把两块相同木块叠在一起平放在长木板上，再用同样方法拉木块（如图丙），记下相应的示数．

（1）若已知每个木块的质量为2kg，请你帮助小明填全表格内的数据；

（2）比较______两次实验数据，可以发现滑动摩擦力的大小与接触面积的大小无关；

（3）比较1、3两次实验数据，可以初步得出的结论是：______．

我国古代院落只的透水地面、园林中下凹式绿地以及现代发达国家城市排水系统所体现的人地关系思想与下列相符的是（）

A.退耕还林合理放牧

B.竭泽而渔焚林而猎

C.地理环境决定论

D.人定胜天论