Young sunflowers face the sun as it rises in the east and follow it across the sky until it sets in the west. Why does this happen? A team of scientists has finally been able to figure{#blank#}1{#/blank#} how and why young sunflowers move.

    Older sunflowers always face east. However, as it{#blank#}2{#/blank#}(turn) out, an internal（内部的）clock helps young sunflowers track the sun so that they can grow better. US biologist Stacey Harmer and her colleagues had it{#blank#}3{#/blank#}(explain) in a recent paper published in the journal Science on Aug. 5.

    {#blank#}4{#/blank#}(depend) on the time of day, certain growth genes seem to work to different degrees on different{#blank#}5{#/blank#}(side) of young sunflowers' stems（茎）. The east side of their stems grows faster during{#blank#}6{#/blank#}day, causing the stems to {#blank#}7{#/blank#}(gradual) bend from east to west. The west side grows faster at night, preparing them for the next morning.

    All this move is highly{#blank#}8{#/blank#}(benefit) to sunflowers. The team found that flowers kept away from the sun had leaves{#blank#}9{#/blank#}were 10 percent smaller on average. According to Harmer, sunflowers which{#blank#}10{#/blank#} (face) with the sun receive more bees and other insects because they like warm flowers.

    Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.

    People are being lured(引诱) onto Facebook with the promise of a fun, free service, {#blank#}1{#/blank#} realizing that they're paying for it by giving up plenty of personal information. Facebook then attempts to make money by selling their data to advertisers that want to send{#blank#}2{#/blank#} (target) messages.

    Most Facebook users don't realize this is happening. Even if they know what the company is up to, they still have no idea {#blank#}3{#/blank#} they're paying for Facebook, because people don't really know what their personal details are worth.

    The biggest problem, however, is that the company keeps changing the rules.  Early on, you could keep everything private. That was the great thing about Facebook -- you could create your own little private network. Last year, the company changed its privacy rules {#blank#}4{#/blank#} many things -- your city, your photo, your friends' names -- were set, by default(默认), to be shared with everyone on the Internet.

    According to Facebook's vice president Elliot Schrage, the company is simply making changes to improve its service, and if people don't share information, they have a “{#blank#}5{#/blank#} (satisfying) experience.”

    Some critics think this is more about Facebook looking to make more money. Its original business model, {#blank#}6{#/blank#} involved selling ads and putting them at the side of the page, totally failed. Who wants to look at ads when they are connecting with their friends online?

    So far the privacy issue {#blank#}7{#/blank#} (land) Facebook in hot water in Washington. In April, Senator Charles Schumer called on Facebook to change its privacy policy.  He also urged the Commission to set regulations for social-networking sites.

    I suspect that whatever Facebook has done {#blank#}8{#/blank#} (invade) our privacy is only the beginning, which is why I'm considering {#blank#}9{#/blank#} (cancel) my account.  Facebook is a handy site, but I'm upset by the idea that {#blank#}10{#/blank#} information is in the hands of people I don't trust. That is too high a price to pay.

    Modern-day robots are programmed to handle tasks that are normally carried out by humans. They are faster and{#blank#}1{#/blank#}(accurate) than human workers and never ask for a pay rise or take breaks!

    Robots are also able to work{#blank#}2{#/blank#}dangerous situations.

    Researchers at the University of Arkansas in the United States say that the mobile robots which have been created already are ideal for the job of hospital attendants. These mobile robots store a{#blank#}3{#/blank#}(detail) map of the hospital in their memory. The robots' sensors can detect{#blank#}4{#/blank#}(object) and quickly get out of the way. Although these robots cannot go up and down know how{#blank#}5{#/blank#}(press) a button of an elevator.

    Researchers at a Massachusetts' university are creating the first robot {#blank#}6{#/blank#}can constantly change its shape according to the task it has to do. These are called polymorphic robots. "Polymorphic" means{#blank#}7{#/blank#}ability to take different forms. A 3D printer{#blank#}8{#/blank#}(place) inside the robot to create the desired shape. The entire process of changing forms in this manner is called the rapid printing technology which is{#blank#}9{#/blank#}(fair) common in the car industry to produce complex 3D structures quickly. Once the robot has performed{#blank#}10{#/blank#}(it) task, it can be melted down and recycled into another useful part by the 3D printer.

    Wang: What's G. P.A.?

    Smith: G. P.A. stands {#blank#}1{#/blank#}the grade quality point average. Quality points are used {#blank#}2{#/blank#}(determine) the students' rank in class, academic honors, and academic warning, and probation or suspension.

    Wang: How can I list my overall undergraduate G. P.A. {#blank#}3{#/blank#}(use)3 digits?

    Smith: I think it's difficult to change your grade {#blank#}4{#/blank#} G. P.A., as our system of grading is different from {#blank#}5{#/blank#} in your country. I'd like to advise you to submit your {#blank#}6{#/blank#}(office) transcripts(文字稿)of all previous undergraduate and graduate work.

    Wang: That's a good idea. I took TOEFL last year, {#blank#}7{#/blank#} I haven't taken the GRE. What's to be done?

    Smith: The GRE may {#blank#}8{#/blank#}(require) by the particular graduate or professional program. You should go over the Table of Program carefully. What's your TOEFL{#blank#}9{#/blank#}?

    Wang: 630.

    Smith: Wonderful. In general, the graduate division requires a TOEFL score of at least 575. Those {#blank#}10{#/blank#}TOEFL scores are in the range 500­575 are admitted conditionally upon successful completion of further coursework in English as a second language.