We’ll remember those days we spent together． [ ] A． when B． in which C． in that D． which 题目和参考答案——青夏教育精英家教网—

题目内容

We’ll remember those days ________ we spent together．

[　　]

A．

when

B．

in which

C．

in that

D．

which

答案：D
解析：

定语从句中先行词为时间，关系词作宾语，故用which。

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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.”

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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．Hard?working.

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.

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