如图所示的电路中，已知电源电压为6V，L₁和L₂都正常发光，对于V₁、V₂、V₃三只电压表的示数，下列各组数据中正确的一组是（      ）

    A great invention by an 18-year-old high school student grew out of a simple problem most teenagers meet with.

    “I'm a teenager and I have a cellphone and my cellphone battery always dies，so I was really looking for a way to improve energy storage，” Eesha Khare said on Tuesday. “That's how I came across the super capacitor.”

    The teenager who came from California, and graduated from high school last week，won a $50，000 prize on May 17，2013 at the Intel International Science and Engineering Fair for creating a device that can store enough energy to charge a cellphone in 20 to 30 seconds.

    “It charges very quickly and can store a lot of energy，” Khare said. “The cool thing is that it's a lot thinner than one strand of hair.”

    Khare hasn't used her invention to recharge a cellphone yet，but she used it to power a light-emitting diode (LED) in order to show its capability(容量). If used on cellphones，the supercharger would slide on to the phone's battery to juice it up in a matter of seconds. The technology isn't available to consumers yet，and it could be years until it is.

    At an Intel event in Phoenix，Khare won the Intel Foundation Young Scientist Award，taking second place overall in the world's largest high school science research competition. She beat out more than 1，600 finalists from 70 countries. She said that she has been approached by several companies to continue her research，but she is now focused on attending Harvard University in autumn.

    “Right now，just my education，but hopefully we'll see what happens in the future，” she said about her plans. “I have a lot of interests，so we'll see what I do in the future.”

某DNA分子片段含有500个碱基对，其中T为400个，则G为____ 个，脱氧核苷酸为____ 个，磷酸为____ 个．

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

    Have you got any wonderful plans for your coming summer vacation? Here are some wonderful films for you to kill time.

Away We Go

    With a baby on his way, a young couple, Burt and Verona, look at their lives and are puzzled about what they really want. So they hit the road and seek a place to call home. On their journey, they visit a handful of characters and learned a lot.

It's about taking the scenic route in life, preparing for the hope and excitement and fear of new beginnings, while never forgetting to look out of the window.

Orphan

    Esther, a bright and well-behaved child, however, is not as innocent as she appears. Soon after being taken home, the peace of her adoptive family is completely changed You want a good horror film about a child from hell Then you got one! Do not, in any cases, take children to see it.

                                                                                          500 Days of Summer

    Tom is in love with Summer from the moment he sees her. Can he accept that she simply likes him for now, not for forever The movie is about Tom wrestling with that reality. Tom remembers his love, Summer, as a series of joys and bafflements (疑惑). But Summer is just herself and he cannot have her.

    Here is a rare movie that begins by telling us how it will end and is about how the hero has no idea why.

2012

The director Roland Emmerich successfully dresses an old story with an old Mayan prediction, which is believed by many to happen in the coming 2012 and as a result, attracts millions of people into the cinema.

    It's just an entertaining Hollywood blockbuster （大片）with plenty of jokes, instead of a description of what the end of the world is really like. Don't take it too seriously!