问题 问答题


甲与乙签订了一份马的试用买卖合同,试用期间为两个月。乙牵回马后,立即与丙签订了买卖合同。双方约定,马的所有权自合同签订之日起转移给丙,但在丙10日内凑齐马款,交付乙后,才将马交付给丙。至第7日,乙因向丁借款又将该马出质于丁,且将该马交付于丁。至第8日,丙与戊签订该马的买卖合同,并通知乙将该马交付于戊。至第9日,该马在丁处被雷劈死,为此引起纠纷。请回答下列问题:

乙、丙签订买卖合同,对甲、乙之间的试用买卖合同有何影响为什么

答案

参考答案:

解析:乙、丙签订买卖合同使甲、乙之间的试用买卖合同转化为有效的买卖合同。因为乙、丙签订买卖合同表明乙购买的意思得以确定,从而使试用买卖转化为有效的买卖。

单项选择题
单项选择题

The human Y chromosome—the DNA chunk that makes a man a man—has lost so many genes over evolutionary time that some scientists have suspected it might disappear in 10 million years. But a new study says it’ll stick around.
Researchers found no sign of gene loss over the past 6 million years, suggesting the chromosome is "doing a pretty good job of maintaining itself," said researcher David Page of the Whitehead Institute for Biomedical Research in Cambridge, Mass.
That agrees with prior mathematical calculations that suggested the rate of gene loss would slow as the chromosome evolved, Page and study co-authors note in Thursday’s issue of the journal Nature. And, they say, it clashes with what Page called the "imminent demise" idea that says the Y chromosome is doomed to extinction.
The Y appeared 300 million years ago and has since eroded into a dinky chromosome, because it lacks the mechanism other chromosomes have to get rid of damaged DNA. So mutations have disabled hundreds of its original genes, causing them to be shed as useless. The Y now contains only 27 genes or families of virtually identical genes.
In 2003, Page reported that the modern-day Y has an unusual mechanism to fix about half of its genes and protect them from disappearing. But he said some scientists disagreed with his conclusion. The new paper focuses on a region of the Y chromosome where genes can’t be fixed that way.
Researchers compared the human and chimpanzee versions of this region. Humans and chimps have been evolving separately for about 6 million years, so scientists reasoned that the comparisons would reveal genes that have become disabled in one species or the other during that time.
They found five such genes on the chimp chromosome, but none on the human chromosome, an imbalance Page called surprising. "It looks like there has been little if any gene loss in our own species lineage in the last 6 million years," Page said. That contradicts the idea that the human Y chromosome has continued to lose genes so fast it’ll disappear in 10 million years, he said. "I think we can with confidence dismiss … the ’imminent demise’ theory," Page said.
Jennifer A. Marshall Graves of the Australian National University in Canberra, a gene researcher who argues for eventual extinction of the Y chromosome, called Page’s work "beautiful" but said it didn’t shake her conviction that the Y is doomed.
The only real question is when, not if, the Y chromosome disappears, she said. "It could be a lot shorter than 10 million years, but it could be a lot longer," she said.
The Y chromosome has already disappeared in some other animals, and "there’s no reason to expect it can’t happen to humans," she said. If it happened in people, some other chromosome would probably take over the sex-determining role of the Y, she said.

The author’s attitude towards the Y chromosome issue seems to be
[A] optimistic. [B] confusing. [C] panicked. [D] objective.