问题 问答题 简答题

控制灌溉的特点?

答案

参考答案:

控制灌溉技术是从插秧到返青期田面保持薄水层,返青以后各生育期不再建立水层,水稻不同生育期以根层土壤含水量作为控制标准来确定灌水时间和灌水定额。土壤含水量控制上限为饱和含水量;下限取饱和含水量的60%----80%(低于田间持水量),是一种能充分发挥水稻自身调节机能和适应能力的灌溉技术。

单项选择题 A1/A2型题
阅读理解

阅读理解。

     It's great fun to explore (探索) new places-it feels like an adventure, even when you know

you're not the first to have been there. But make sure not to get lost or waste time going round

in circles.

     Do the map reading if you're being driven somewhere.It'll be easier if you keep turning the

map so it follows the direction you're traveling in Keep looking ahead so that you can give the

driver lots of warning before having to make a turn, or you'll have to move to the back seat.

     Get a group of friends together and go exploring.You'll need a good map, a compass

(指南针), a raincoat,a cell phone to call for help in case you get lost, and a bit of spare cash

for emergencies (应急现金). Tell someone where you're going before you set out and let

them know what time you expect to be back. The test is in not getting lost, not in seeing how

fast you can go, so always stick together, waiting for slower friends to catch up.

     See if your school or a club organizes orienteering activities, in which you need a map and

a compass to find your way. This can be done as a sport, with teams trying to find the way

from A to B (and B to C, etc. ) in the fastest time, or simply as a spare-time activity. Either

way, it's not only good fun, but a great way to keep fit.  

1. Sitting beside the driver, you should _______ .    

A. direct the driver when necessary

B. look ahead to see where there's a turn

C. move to the back seat if feeling uncomfortable

D. keep looking at the map to find a place to go to 

2. Why do you need to tell someone your exploration plan  before setting out?     

A. To get information when in danger.

B. To be saved in case of an accident.

C. To share the fun with him/her in exploration.

D. To tell him/her what's going on with the group members. 

3. Orienteering activities can_______  .  

A. make people work fast

B. help people stay healthy

C. help people organize other activities

D. make people get prepared for sports

4. The text mainly talks about_______.     

A. the fun of exploration

B. what to bring for exploration

C. the way to use a map in exploration

D. how to prevent getting lost in exploration