创腔引流袋应放置于（） A.低于创腔10cm处 B.低于创腔20cm处 C.低于创腔

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

If you garden for pleasure, you may not be aware of how beneficial this hobby is for your health. While you are preparing your garden to grow fresh plants, you are actually doing an amount of exercise as well. Basic yard care tasks such as cleaning the grass or moving fallen leaves away are also good ways to get physical exercise.  小题1:. Just think of the mental relaxation you experience when working in the garden.

Various health experts and university studies show that gardening and yard work are more than just enjoyable hobbies.  小题2: . This is truly a great thing as you can use your whole body while you are working. Gardening also involves a number of different kinds of exercise, including stretching and weight lighting.

Activities in the yard and garden are also a form of exercise that is appropriate for a variety of people and age groups. Depending on the activity, gardening and yard work are not quite as hard on your body as jogging or running.  小题3: Like other forms of exercise, gardening can help lower blood pressure and cholesterol (胆固醇) levels and keep away heart disease. Moreover, it helps burn a lot of calories.

 小题4:. But you can increase the amount of time you spend gardening to improve your health even more. If you are not an active gardener, think about starting a small garden. This way, you can combine the joys of growing your own food with light exercise.

When gardening, like other forms of exercise, you need to follow a few basic tips to maximize your experience. First, you should warm up a bit. Do some basic stretches so that your muscles are ready.  小题5: . This is especially important if you are not already an active gardener.

A．They are also unique forms of exercise that allow you to do something creative and fun.

B．Then if you plan to lift heavy objects, always lift them with your knees, not your back.

C．Additionally, gardening and yard care are beneficial for your mental health, too.

D．In the winter, you may wonder what kinds of activities you can do in the garden.E.There are a lot of activities that you can do in your yard and garden.

F.This means that even if you are older, you can still enjoy the exercise.

G.If you already garden, good for you!

2010年，我市遭受了严重的旱灾．

（1）人工增雨是缓解干旱的重要手段，干冰可用于人工增雨．撒在云层中的干冰升华时______（填“吸收”或“放出”）热量，使空气中的水蒸气迅速凝结成水滴形成雨．

（2）施用磷肥可以提高农作物的抗旱能力，其中一种磷肥的主要成分是磷酸二氢钙[Ca（H₂PO₄）₂]，该化合物中磷元素的化合价为______．

（3）硬水是指含有较多______（填写离子符号）离子的水．

水泵铭牌上的流量指水泵在（）下最佳工作状态时的出水量，它又称为额定流量。

( )是编写一份书面范围说明书，作为未来项目决策的基础。

A．范围计划

B．范围定义

C．范围核实

D．范围变更控制

根据新知识与原有认知结构的关系，知识的学习可以分为（）。

A.上位学习

B.概念学习

C.下位学习

D.命题学习

E.并列结合学习