据所道，反式脂肪酸目前被广泛添加于加工食品中，而反式脂肪酸会导致心脏病和糖尿病等疾病。已知某种反式脂肪酸的结构简式为（键线式：只用键线表示，如苯环：），下列判断不正确的是       （   ）

阅读下面文段，回答下列各题。

    虞舜者，名日重华。舜父瞽叟盲，而舜母死，瞽叟更娶妻而生象，象傲。瞽叟爱后妻子，常欲杀舜，舜避逃；及有小过，则受罪。舜事父及后母与弟，日以笃谨，匪有解。

    舜，冀州之人也。舜耕历山，渔雷泽，陶河滨，作什器於寿丘，就时於负夏。舜父瞽叟顽，母嚣，弟象傲，皆欲杀舜。舜顺通不失子道．兄弟孝慈。欲杀，不可得；即求，尝在侧。

    舜年二十以孝闻。三十而帝尧问可用者，四岳成荐虞舜，日可。於是尧乃以二女妻舜以观其内，使九男与处以观其外。舜居妫油①，内行弥谨。尧二女不敢以贵骄事舜亲戚，甚有妇道。尧九男皆益笃。舜耕历山，历山之人皆让畔；渔雷泽，雷泽上人皆让居；陶河滨，河滨器皆不苦窳②。一年而所居成聚，二年成邑，三年成都。尧乃赐舜烯衣，与琴，为筑仓廪，予牛羊。瞽叟尚复欲杀之，使舜上涂廪，瞽叟从下纵火焚廪。舜乃以两笠自扦而下去得不死后瞽叟又使舜穿井舜穿井为匿空旁出舜既入深瞽叟与象共下土实井舜从匿空出去瞽叟、象喜，以舜为已死。象日“本谋者象。”象与其父母分，於是日：“舜妻尧二女，与琴，象取之。牛羊仓廪予父母。”象乃止舜宫居，鼓其琴。舜往见之。象鄂不怿，日：“我思舜正郁陶！”舜日：“然，尔其庶矣！”舜复事瞽叟爱弟弥谨。於是尧乃试舜五典百官，皆治。

    舜入于大麓，烈风雷雨不迷，尧乃知舜之足授天下。尧老，使舜摄行天子政，巡狩。舜得举用事二十年，而尧使摄政。摄政八年而尧崩。三年丧毕，让丹朱，天下归舜。舜谓四岳日：“有能奋庸美尧之事者，使居官相事？”皆日：“伯禹为司空，可美帝功。”舜日：“嗟，然！禹，汝平水土，维是勉哉。”舜日：  “契，百姓不亲，五品不驯，汝为司徒，而敬敷五教，在宽。”舜日：“皋陶，蛮夷猾夏，寇贼奸轨，汝作士，五刑有服，五服三就；五流有度，五度三居：维明能信。”舜日：“嗟！四岳，有能典朕三礼？”皆日伯夷可。舜日：“嗟！伯夷，以汝为秩宗，夙夜维敬，直哉维静絮。”伯夷让夔、龙。舜日：“然。以夔为典乐，教裤子③，直而温，宽而栗，刚而毋虐，简而毋傲；诗言意，歌长言，声依永，律和声，八音能谐，毋相夺伦，神人以和。”一节选《史记·五帝本纪》

【注】①妫讷( )：水名，在山西省永济市南历山（今首阳山）。②苦窳( )：粗

糙质劣。③樨( )子：贵族子弟。

B

    I'm David. Long ago I came to the city near my hometown to find a job. I met all kinds of difficulties and I used up all my money soon.

    It was dark outside one day. I got on a bus quietly. Suddenly, a passenger cried in a loud voice, "someone has stolen my money!" I felt nervous, because his money was in my hand. Some people suggested the driver drive the bus to the police station, but some were against it because they were in a hurry to go back home. The whole bus was very noisy. The driver then stopped the bus by the roadside and turned on the lights. At that time, one passenger said, "Turn off the lights and give the thief(小简)a chance to take out the money."Then the bus got dark.

    When I was still thinking about whether to take out the money or not, the lights were turned on again. There was no money on the floor. Someone said, "Give him one more chance." Then the lights were turned off again. I became even more nervous. The lights were turned on again but they got the same result.

    Then the passengers fell into an open discussion. Later, someone said, "Give him the last chance!" I felt awakened(醒悟的) and took out all the money when the lights were turned off again.

    For many years I have been grateful to those who gave me three chances. When the first and Second chances come, you may not be prepared well or don't have enough courage to act. When the third chance comes, you should know clearly what you should do.

根据短文内容，选择最佳选项。

请认真阅读下面短文，并根据各题所给首字母的提示，写出一个合适的英语单词完整、正确的形式，使短文通顺。
    You're standing with your classmates. E____   is talking except you. Perhaps you're afraid they will laugh at when you say. Maybe you just aren't b____ enough to speak. Shyness is like a snake that crawls（爬进）into our mouth and s____ us speaking. But we shouldn't let it stay there.
    I am 29 years old. Even today, that snake still sometimes v____  me. When I was in high school, I was so shy that I wouldn't talk to anyone except my parents and best friends. If a stranger asked me the w____ to a local shop, it was as if I'd forgotten how to talk. One summer, I got a j____  in a restaurant and that helped a lot. It meant I had to talk to customers（顾客）. I had to tell them how m____ their meal cost. I had to ask them if they want to drink Coke or Sprite.
    This job taught me how to speak with people. You may be too young to find a part-time job. But you can look for other c____ to speak with people. You can offer to help an old woman carry her heavy bag. O____  you can go to get a newspaper for your family. If you do these things for a while, the "shyness" snake will soon begin to l____  you alone. It'll look for another mouth to crawl into.

物体放在凸透镜前，到凸透镜的距离是16cm，若此时光屏上得到放大的像，则所用的透镜的焦距可能是（  ）