漂亮的符号
姓名，年级：
时间：
考点规范练38(选修8 Unit 3怎样练腹肌给孩子的祝福语)青岛旅游
Ⅰ.阅读理解
A
（2017·全国Ⅰ)
A build—it-yourlf solar still(蒸馏器) is one of the best ways to obtain drinking water in areas where the liquid is not readily available。Developed by two doctors in the U.S.Department of Agriculture，it’s an excellent water collector.Unfortunately,you must carry the necessary equipment with you,since it’s all but impossible to find natural substit
utes。The only components required，though，are a 5’×5' sheet of clear or slightly milky plastic，six feet of plastic tube，and a container—perhaps just a drinking cup—to catch the water.The pieces can be folded into a neat little pack and fastened on your belt.
To construct a working still,u a sharp stick or rock to dig a hole four feet across and three feet deep。Try to make the hole in a damp area to increa the water catcher’s productivity.Place your cup in the deepest part of the hole。Then lay the tube in place so that one end rests all the way in the cup and the rest of the line runs up-and out-the side of the hole。
Next,cover the hole with the plastic sheet，curing the edges of the plastic with dirt and weighting the sheet’s center down with a rock.The plastic should now form a cone(圆锥体） with 45-degree—angled sides。The low point of the sheet must be centered directly over,and no more than three inches above,the cup.
The solar still works by creating a greenhou under the plastic。Ground water evaporates （蒸发) and collects on the sheet until small drops of water form,run down the
material,and fall off into the cup.When the container is full,you can suck the refreshment out through the tube,and won't have to break down the still every time you need a drink.
1.What do we know about the solar still equipment from the first paragraph？
A。It’s delicate. B.It’s expensive。 C.It’s complex。 D.It's portable.
好玩的英语
2.What does the underlined phra “the water catcher” in paragraph 2 refer to？
A。The tube. B.The still。 C。The hole. D。The cup.桢楠
3。What is the last step of constructing a working solar still?
A。Dig a hole of a certain size。 B.Put the cup in place.
C。Weight the sheet’s center down. D.Cover the hole with the plastic sheet。价格欺诈
4。When a solar still works,drops of water come into the cup from 。
A.the plastic tube B.outside the hole
C。the open air D。beneath the sheet
B
Brooke Martin's golden retriever(金毛猎犬）Kayla hated being left alone or parated.She would howl,pace，and chew on things。Brooke learned that other people had the same problem with their pets。She wondered：“What if you could talk to your dog if you were gone？”
安徽特色小吃Working with her father in their garage，the 16-year—old came up with veral ideas。Finally,she invented a device that allowed pet owners to video chat with their pets!She calls the device iCPooch。“The dog doesn’t have to answer the call，”explains Brooke。“It comes up immediately on the screen on its end.It’s a two—way audio and video—you can e and hear each other。”With a click of a button you can even nd the dog a treat!
Her invention has earned her a spot competing against nine other finalists in a young scie
ntist competition for middle—school students.The finalists，lected bad on their short video prentations，are working with mentors over the summer before heading to the final competition in St.Paul，Minn.
After Martin's video put her among the 10 finalists in the Discovery Education 3M Young Scientist Challenge，she was paired with Delony Langer-Anderson,a product development scientist in 3M’s consumer health care division.“I just lead her down the product development path,”Langer—Anderson told LiveScience.This path includes guidance on how to test the potential product,which combines a video chat device that answers immediately on the dog’s end with a dog treat device the owner can remotely activate。
