【题目】 Many science fiction stories tell about explorers arriving in a new world. The explorers then use some kind of high-tech device to test for breathable air or signs of life. But here on Earth, science fiction is becoming reality through a new sampling technology called environmental DNA, or e-DNA for short. Scientists can use it to identify rare species or estimate fish populations with just a little air or water.

Environmental DNA can be used in two ways. One is to identify the creatures that live in a certain place. The other is to confirm the presence or lack of a specific creature.

Caren Goldberg is one of the first biologists in the northwestern United States to take the technology from the testing stage to actually using it. She sees e-DNA as a way to get answers more efficiently, and with less destruction compared to traditional survey techniques. Until recently, scientists depended on diving deep, netting or using an electric current to temporarily catch fish.

This newer way to identify what lives in the environment is becoming popular around the world. Animal experts in Vietnam are using the e-DNA to find the last, wild Yangtze giant softshell turtles. One researcher on the Caribbean island of Trinidad is using the sampling technology to find endangered golden tree-frogs. And in Madagascar, it is being used to identify amphibian (两栖动物) diseases.

Ms. Goldberg has used e-DNA testing to confirm the local extinction of a leopard frog in the American state of Idaho. She has also been asked to document the spread of the New Zealand mud-snail in the state of Washington. The creature has been found in lakes and other waterways across the state.

Scientists working with the technology say they do not expect robots to replace field biologists anytime soon. But the old-fashioned field work could soon be more targeted.

1By using e-DNA, Caren Goldberg has ________.

A.succeeded in catching many fishes.

B.found the existence of golden treefrogs.

C.documented the spread of softshell turtles.

D.proved the disappearance of the leopard frog in Idaho.

2What can we infer from the last paragraph?

A.Robots will replace scientists soon.

B.Some scientists are against using e-DNA.

C.The old-fashioned field work may disappear.

D.Many biologists are unwilling to do the field work.

3The passage can be sorted as a(n) ________.

A.science fictionB.experiment report

C.science reportD.bio-diversity discovery

【题目】 My mother was diagnosed with Alzheimer’s (老年痴呆症) last summer. Suddenly, it was difficult for me to accept that the roles were now changed — my mother became my child, and I became her mother. I became impatient, argued with her, once I even yelled at her. Gradually, I was used to this kind of life. Now I am able to deal with her and the situation better. I have learned a lot of life lessons from the experience.

My mother reacts very sensitively to my feelings. That is typical of Alzheimer’s patients. When I visit her, feeling hectic and tense, she reacts immediately, takes on my mood, and becomes nervous and negative. But when I appear cheerful and attentive, she is happy. This has taught me to pay more attention to my own feelings when I am with other people.

Through the illness my mother has developed a childlike tactlessness (不得体). Eating out in restaurants, for example, is a bit embarrassing when she shouts at the waiter that the food is so bad or talks about people at the next table in a loud voice. Of course I make sure that my mother doesn’t hurt anyone, but I’ve stopped complaining about others and have become more tolerant.

I have also learned that everything has special value. When my mother got sick I didn’t want to burden my two daughters with it. They are young and have enough going on with their education, and starting their careers. I felt that it was simply my job as my mother’s daughter. The most wonderful discovery I’ve made through my mother’s disease may be that my children not only offer to help me, but that they take care of my mother on their own actively. They visit her often, play cards with her, and look at photo albums together with her. It shows me that it’s all worth it.

1What does the underlined “hectic” in the Paragraph 2 mean?

A.delighted.B.touched.

C.surprised.D.stressed.

2Which of the following is the common behavior of Alzheimer’s patients?

A.Being particular about clothes.B.Being curious about feelings.

C.Being afraid of strange people.D.Being sensitive to others’moods.

3What can we know about the writer’s daughters according to the passage?

A.They are naughty.B.They are considerate.

C.They are traditional.D.They are selfish.

4What is the passage mainly about?

A.How I Cared for My Sick Mother.B.How I Became More Tolerant.

C.What I Have Learned from Alzheimer’s.D.Why I Am Feeling stressed.

 0  147594  147602  147608  147612  147618  147620  147624  147630  147632  147638  147644  147648  147650  147654  147660  147662  147668  147672  147674  147678  147680  147684  147686  147688  147689  147690  147692  147693  147694  147696  147698  147702  147704  147708  147710  147714  147720  147722  147728  147732  147734  147738  147744  147750  147752  147758  147762  147764  147770  147774  147780  147788  151629 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网