【题目】 Dry ice is carbon dioxide in frozen form, with a temperature of about -78.3℃. 【1】 Instead, when dry ice melts, it turns into a gas. So when you see dry ice “smoking”, it’s frozen carbon dioxide melting into its gaseous state. Dry ice is a popular matter in science experiments and for a good reason. It creates projects that look cool.
Experiment: Healthy Dry Ice Yogurt Popsicles (冰棍)
This dry ice experiment is a simple project, but it’s certainly wonderful. 【2】 Even kids as young as five will at least appreciate the observations. It should take you about 10 minutes or less to have a frozen treat to enjoy.
Materials
One large block of dry ice
Large spoon or tube-shaped piece of metal
Four Popsicle sticks
One cup of your favorite juice
Tall glass filled with water
Directions
Use the large spoon, or tube-shaped piece of metal to make a Popsicle-shaped hole in the middle of the block of dry ice. You can set the ice on a towel on your counter to do this work. 【3】
Add a Popsicle stick to the middle of the space so that when you pour in the liquid, it will freeze around the Popsicle stick.
【4】 After several minutes, remove the Popsicle from the block of dry ice and dip it into a tall glass of water. Do this to warm up the Popsicle just a bit first. 【5】 You are sure to succeed!
A. Prepare all the necessary materials.
B. Otherwise, it will be too cold to enjoy.
C. It has appeal to a wide range of audiences.
D. Unlike regular ice, dry ice doesn’t melt into a liquid.
E. Keep in mind that it’s okay if it’s not exactly Popsicle-shaped.
F. The number of experiments you can perform using dry ice is endless.
G. Hold the Popsicle stick in place and wait a few minutes for your Popsicle to harden.
【答案】
【1】D
【2】C
【3】E
【4】G
【5】B
【解析】
这是一篇说明文。文章介绍了如何用干冰制作冰棍的实验。
【1】根据下文的instead这一提示词，可知，和常规的冰不一样，干冰不会融化成液态。而是直接变成气态。故选D。
【2】根据下一句的Even kids as young as five will at least appreciate the observations.甚至五岁的孩子都会喜欢看。可知，这个实验会广泛吸引观众。故选C。
【3】根据本段前面的Use the large spoon, or tube-shaped piece of metal to make a Popsicle-shaped hole in the middle of the block of dry ice. You can set the ice on a towel on your counter to do this work.用大勺子或管状的金属棒在干冰里挖一个冰棍状的洞。可以在干冰下面垫个毛巾，在吧台上操作。可知，前文提及了挖洞（make a Popsicle-shaped hole），其中Popsicle-shaped在E项中复现，故E. Keep in mind that it's okay if it's not exactly Popsicle-shaped.记住，这个洞挖得不那么像冰棍也不要紧。最符合语境。故选E。
【4】上文提到在那个挖出来的洞中间加一根冰棍棒，再倒入果汁。特别提到it will freeze around the Popsicle stick（冰棒周围会结冰。）可知，G. Hold the Popsicle stick in place and wait a few minutes for your Popsicle to harden.接下来就应该是固定住冰棍棒，然后等待冰棍慢慢凝固成型。最符合语境。故选G。
【5】根据前一句Do this to warm up the Popsicle just a bit first.冰棍做好以后要在水里浸泡一会稍微加热一下。可知，接下来会解释要浸泡加热的原因。故B. Otherwise, it will be too cold to enjoy.要不然就会太冰而无法吃了。最符合语境。故选B。
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