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（请给出正确答案）
A.improve the efficiency of it
B.turn plant sugars to a new form. of energy
C.make green plants a new source of energy
D.get more sugars and starches from plants
答案
更多“Scientists study how photosynthesis works because they want to __________.”相关的问题
第2题
A．interchange
B．interrelation
C．intercourse
D．interaction
第3题
How do scientists estimate the age of language？
A．By studying animals" evolution.
B．By studying human genes.
C．By using mathematical tools.
D．By using the age of living species.
第4题
A．Because all of them had been in a very good school.
B．Because all of them had a very clever brain.
C．Because all of them knew how to study and how to think.
第5题
32 Scientists study how photosynthesis works because they want to_____.
A improve the efficiency of it.
B turn plant sugars to a new form. of energy.
C get more sugars and starches from plants.
D make green plants a new source of energy.
第6题
Why do the scientists want to do the study？ 查看材料
A.They want to make sure if chocolate is really beneficial.
B.They want to see how chocolate improve health.
C.They want to know why people love to eat chocolate.
D.They want to find out the benefits of pure flavanols.
第7题
A．Need for good science teaching.
B．Every person, including governors, lawyers and business leaders should study science.
C．Young people should form. a correct attitude to science.
D．Students must know what science is and how scientists work and think.
第8题
Why do some scientists study how plants convert sunlight carbon dioxide, and water into sugars and starches？ _______A Because they want algae to produce sugars and starches.B Because they want green plants to become a new source of energy.C Because they want to turn plant sugars to a new form of energy.D Because they want to make photosynthesis more efficient.
第9题
Understanding how nature reacts to climate (气候) changewill require checking key, life cycleevents-flowering, the appearance of leaves, the first frog calls of the spring-all around theworld. But ecologists (生态学家) cant be everywhere, so theyre turning to non-scientists, some-times called citizen scientists, for help. A group of scientists and educators set up an organization last year called the National Phenology Network. "Pbenology" is what scientists call the study of the timing of events in nature. One of the groups first efforts is to ask scientists and non-scientists to collect information aboutplant flowering and leafing every year. The program, called Project BudBurst, collects life cycleinformation on a variety of common plants from across the United States. People taking part in theproject record their information on the Project BudBurst website. "People dont have to be scientists-they just have to look around and see whats in theirneighbourhood," says Jennifer Schwartz, a scientist with the project. "As we collect this information, well be able to know about the changes of plants and animals as the climate changes." Not only that, the information also helps scientists learn about how these changes will have aneffect on people, scientists examining lilac (丁香花) flowering in western United States reportedthat in years when lilacs flowered early--before May 20th-wildfires later in the summer and fallwere likely to be larger and more serious. Lilac flowering, then, could serve as an alarm bell. "The best way for us to increase our knowledge of how plants and animals are reacting toclimate change is to increase the count of information we have," Schwartz says. "Thats why weneed citizen scientists to get as much information from as many places on as many plants and animals over as long a time period as we can. 根据材料请回答下列各 Project Budburst aims to_________
A.study animal behavior. all year round
B.invite citizen scientists to do scientific research
C.collect information on the life cycles of common plants
D.help ecologists learn about wildfires in western United States
第10题
听力原文： A British study of how diet affects the health of new mothers and their babies produced the surprise finding that vegetarian women are more likely to have girls, one of the report's authors said yesterday.
In what is thought to be the first study of its kind, researchers at Nottingham University in central England found significant differences in the sex of babies born to vegetarian and meat and fish-eating women. They were examining the health conditions in vegetarian and non-vegetarian mothers, looking at things like hemoglobin levels, which show how much iron the mother has in her blood, and birth weights.
Altogether 5,942 pregnant women were involved in the study when they were booked in Nottingham's City Hospital during 2001. According to the researchers, vegetarian mothers were defined as pregnant women who avoided meat and fish. Nearly five percent were vegetarian among them, a total of more than 250 women.
The birth ratio in Britain is that for every 106 boys born there are 100 girls, that's pretty constant. In their sample group of vegetarians there were 81.5 boys born for every 100 girls.
To further test their surprise findings, they increased the sample number to what scientists called a "statistically significant" level. The study was extended for a further six months so that the sex of more babies could be looked at. The results, covering around 150 more vegetarian women, were" just about exactly the same".
The study also found that vegetarian mothers were less likely to smoke during pregnancy -- 10 percent did so, compared with 20 percent of meat-eaters.
(36)
A．Vegetarian women are more likely to have girls.
B．Non-vegetarian women are more likely to have girls.
C．Vegetarian women are more likely to have boys.
D．Vegetarian women are more likely to smoke during pregnancy.
