D．It's programmed to land autonomously.
D [考查细节理解。根据第四段第一句中的“the drone will make an emergency landing to ensure the customer's safety”可知，当遇到紧急情况时，该飞行器可以自动着陆，以保证乘客的安全。故D项正确。] 11．What is the drawback of the EHANG 184?
A．It's too scary to ride in it. B．It costs a lot to take a ride. C．It runs out of power easily. D．It only flies at a low altitude.
C [考查细节理解。根据第四段中的“The EHANG 184 has a battery life of 30 minutes and a flight range of just 31 miles.”可知，EHANG 184只能连续航行30分钟，故C项正确。]
12．Which of the following makes the EHANG 184?
A．A company in Dubai. B．A Chinese company. C．A company in Abu Dhabi. D．An American company.
B [考查细节理解。根据第四段第三句中的“the producer，China-based EHANG，says”可知，该空中飞行器是由中国的一家公司制造的，故B项正确。]
七
An egg sinks to the bottom if you drop it into a glass of ordinary drinking water but what happens if you add salt？The results are very interesting and can teach you some fun facts about density(密度)．
What you'll need：
*One egg *Water *Salt *A tall drinking glass Instructions：
Pour water into the glass until it is about half full. Mix in lots of salt(about 6 tablespoons)．
Carefully pour in plain water until the glass is nearly full(be careful not to mix
the salt water with the plain water)．
Gently lower the egg into the water and watch what happens. What's happening?
Salt water is denser than ordinary tap water. The denser the liquid is，the easier it is for an object to float in it. When you lower the egg into the liquid it drops through the normal tap water until it reaches the salt water，and at this point the water is dense enough for the egg to float. If you were careful when you added the tap water to the salt water，they would not mix，enabling the egg to amazingly float in the middle of the glass.
【语篇解读】 本文主要介绍了鸡蛋放入盐水中的实验过程。
【长难句解读】 If you were careful when you added the tap water to the salt water，they would not mix，enabling the egg to amazingly float in the middle of the glass. [分析] 本句是一个复合句。If引导条件状语从句；when引导时间状语从句；enabling the egg to amazingly float in the middle of the glass是现在分词短语作结果状语。
[译文] 如果你把自来水加到盐水里时比较小心的话，它们就不会混在一起，这样会让鸡蛋在玻璃杯的中间奇迹般地漂浮起来。 1．Which of the following is the CORRECT order?
①Mix in lots of salt.
②Gently lower the egg into the water.
③Carefully pour in plain water until the glass is nearly full. ④Pour water into the glass until it is about half full. A．④②①③ C．①④③②
B．④①③② D．③④①②
B [考查细节理解。根据第三部分的“Pour water into the glass until it is about half full.”和“Gently lower the egg into the water and watch what happens.”可知，往杯子里倒半杯水是第一个步骤，而轻轻把鸡蛋放进水里，观察结果是最后一个步骤，故选B。]
2．What will happen if you drop an egg into a glass of water with about 6 tablespoons
of salt?
A．It will float in the water. B．It will sink to the bottom. C．Nothing will happen. D．The result is not known.
A [考查推理判断。根据第四部分中的“The denser the liquid is，the easier it is for an object to float in it.”和最后一句“If you were careful when you added the tap water to the salt water，they would not mix，enabling the egg to amazingly float in the middle of the glass.”可推知，鸡蛋放入盐水里会浮起来。] 3．Why can the egg float in the water according to the passage?
A．Because ordinary tap water is denser than salt water. B．Because ordinary tap water is as dense as salt water.
C．Because the denser the liquid is，the easier it is for an object to float in it. D．Because the more the liquid there is，the easier it is for an object to float in it. C [考查细节理解。根据最后一部分中的“Salt water is denser than ordinary tap water. The denser the liquid is，the easier it is for an object to float in it.”可知，液体的密度越大，物体越容易漂浮，而鸡蛋能够在盐水中浮起来是因为盐水的密度大，故选C。]
八
Goodreads recommends the following books you want to read for the event to come.
1．The Lyrics：1961-2012 By Bob Dylan Simon&Schuster，$60
What it's about：This heavy，well-timed publication contains lyrics by the songwriter who just won the Nobel Prize in Literature，from his first album，Bob Dylan，through Tempest.
What's to love：The times may be changing，but Dylan's fans are constant-traditional devotees who will want this epic collection for their shelves，to sit beside those beloved old large papers.
2．Taylor Swift：This Is Our Song
By Tyler Conroy Simon & Schuster，$28
What it's about：An elegant fanzine celebrating all things about Taylor Swift，especially the pop star's countless fans.
What's to love：Mom and/or Dad，the fans of Taylor Swift，will think you're pretty cool if he or she discovers this temple to Taylor under the Christmas tree(even if it is a book)．
3．Misty Copeland By Gregg Delman Rizzoli，$39.95
What it's about：Star-figure female ballet dancer Misty Copeland strikes a pose(95，to be exact)in photos taken between 2011 and 2014，in the casual setting of dance studios.
What's to love：Since becoming the first African American woman to be named a principal dancer with the American Ballet Theatre，Copeland has become a cultural phenomenon，and Delman's arresting pictures capture(捕捉)her muscular power and elegance.
4．@NatGeo：The Most Popular Instagram Photos By National Geographic National Geographic，$19.95
What it's about：National Geographic's popular Instagram account(nearly 63 million followers)comes to book form in this title filled with eye-popping images from around the world.
What's to love：Here's proof that NatGeo's talented photographers have conquered social media while maintaining the usual quality of their work.And for fans of more traditional coffee-table-size books，check out National Geographic's Wild，Beautiful Places：Picture-Perfect Journeys Around the Globe($40)．
【语篇解读】 本文主要推荐了几本在圣诞节期间值得阅读的书。 4．Which author is noted for literature achievements?
A．Bob Dylan. C．Gregg Delman.
B．Tyler Conroy. D．National Geographic.