Larry asks Bill and Peter to go on a picnic with him，but________of them wants to，because they have work to do. (2012·新课标全国，31)
A．either B．any
C．neither D none
________ can be good at something for 40 years if he doesn’t love it.(2013·江西，23)
A．Anybody B．Everybody
C．Nobody D．Somebody
At our factory there are a few machines similar to________described in this magazine.
(2013·天津，12)
A．them B．these
C．those D．ones
The traffic on the main streets has a longer green signal than________on the small ones. (2013·四川，2)
A．one B．this
C．that D．it
Plants may not have eyes and ears，but they can recognize their siblings (兄弟姐妹)，and researchers at the University of Delaware have discovered how.The ID system lies in the roots and the chemical signals they secrete (分泌)．
Canadian researchers published that sea rocket，a common seashore plant，can recognize its siblings.Susan Dudley observed that when siblings are grown next to each other in the soil，they “play nice” and don’t send out more roots to compete.However，the moment one of the plants is thrown in with strangers，it begins competing with them by rapidly growing more roots to take up the water and mineral nutrients in the soil.
After reading Dudley’s study，Bais decided to find the method behind the sibling recognition.Working in his laboratory，Bais and his doctoral student Meredith Biedrzycki set up a study with wild populations of Arabidopsis thaliana.In a series of experiments，young seedlings were exposed to liquid media containing the root secretions from siblings，from strangers，or only their own secretions.The length of the longest lateral (侧面的) root was measured.The exposure of plants to the root secretions of strangers induced (引诱) greater lateral root formation than exposure of plants to sibling secretions.Strangers planted next to each other are often shorter，because so much of their energy is directed at root growth.Because siblings aren’t competing against each other，their roots are often much shallower (浅的)．
Biedrzycki did the painstaking laboratory research，observing more than 3,000 plants involved in the study every day for seven continuous days and documenting the root patterns.“Arabidopsis roots are nearly translucent (半透明的) when they are young and were also twisted when I removed them from plates，”Biedrzycki notes.“This manuscript (手稿) is very important for my research since the focus of my thesis project is understanding the biochemical ways behind root secretions.”
The research also may have implications for the home gardener.“Often we’ll put plants in the ground next to each other and when they don’t do well，we blame the local garden center where we bought them or we attribute their failure to a germ，”Bais says.“But maybe there’s more to it than that.”
1.Which of the following would be the best title for this passage?
A．A Great Biology Researcher
B．Plants Recognize Their Siblings
C．Plants’ Roots and Secretions
D．A Research on Plants
2. What encouraged Bais to study the sibling recognition?
A．Sea rocket.
B．Plants’ sensing system.
C．Biedrzycki’s thesis project.
D．Dudley’s study.
3. What does the underlined word “painstaking” in Paragraph 4 probably mean?
A．Important. B．Adventurous.
C．Careful. D．Hardworking.
4.What can we infer from the last paragraph?
A．The local garden center should be blamed when plants can’t grow well.
B．The local garden center often sells low quality seeds to customers.
C．Plants in the home garden can’t grow well because of the germ and seeds.
D．Competing against strangers，plants in the home garden can’t grow well.
Alomada Racraotion and Fork Deportment (ARFD)
(510)7477529
TEEN TRIP TO
THE LELAND HIGH SNOW PLAY
FOR Teens Currently in 6th to 12th Grades
LELAND HIGH SNOW PLAYClass #8389
Friday，December 9 (NonPublic School Holiday)
8∶00 a．m.to 7∶00 p．m.
Cost per person：$50 ($60 after January 22)—Includes：Lunch，Admission and Transportation
With a 4,000 sq.ft.day use lodge，the Leland High Snow Play has a huge supply of tubes to choose from，along with awesome tows(拖车) that will tow you up to the top of the hill！Our varied terrains(地形) have something for everyone，while the lodge provides a snack bar，video games，pool tables，five indoor restrooms，a warm fire，and a sun deck with plenty of tables and chairs over looking the play area outside.
Additional liability(责任) form required for the trip.
Be sure to bring warm clothing and prepare for the cold，but dress in layers in case it warms up.Wear dry boots，socks，and sunscreen.If possible，bring a mobile phone in case of emergency，as well as money for snacks and a light dinner；or bring your own food and drinks.Meet at The Underground (Veteran’s Building2203 Central Avenue)—don’t be late!
Do not bring electronic or fragile items during the trip.The ARFD is not responsible for your personal belongings or money.
Refunds are issued only if the ARFD cancels this trip due to weather conditions.
Click here to download the registration form and “Leland High Snow Play Liability Form”．
•Register in person，or mail the completed form to Leland High Snow Play，Inc.Send the liability form and payment to the ARFD Office,2226 Santa Clara Avenue，Alameda.
•Fax the registration and liability form accepted with VISA，(510)7477566.
•Online registrations available at www.arpdeplay.com. Make sure you bring your completed liability form on the trip.
1.According to the text，the cost doesn’t include ________.
A．lunch B．drinks
C．admission D．transportation
2.The purpose of the text is to ________.
A．introduce a famous tour agency
B．explain the details of a school activity
C．urge teenagers to climb a snowy mountain
D．advertise a trip to the Leland High Snow Play
3.Teenagers who want to take part in the activity need to ________.
A．wear some warm clothes
B．climb the hill themselves
C．pay for tows individually
D．wear hats to protect themselves from the sun
4.From the text it can be inferred that ________.
A．the activity is very dangerous
B．the weather there is changeable
C．the trip will involve outdoor activities only
D．12yearold children are not allowed to take the trip
