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问题 单项选择题

下列关于承兑的表述中，错误的是（）。

A．承兑是指汇票付款人承诺在汇票到期日支付汇票金额的票据行为

B．承兑是商业汇票特有的制度

C．承兑是银行汇票特有的制度

D．承兑人不得以其与出票人之间的资金关系来对抗持票人

答案

参考答案：C

选择题

由图中甲、乙两种商品的价格与需求的走势，可以推断(　 　)

A．甲乙两种商品互为替代品

B．甲乙两种商品可能都处于卖方市场

C．乙商品的价格与需求呈正相关变动

D．甲商品为生活必需品的可能性更大
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单项选择题

Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones, US reseachers reported on Thursday.
Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s. University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.
"Our research shows that the hormones of pregnancy are protecting the brain, including estrogen, which we know has many neuroprotective effects, " Kinsley said.
"It’s rat data but humans are mammals just like these animals are mammals, " he added in a telephone interview. "They go through pregnancy and hormonal changes. "
Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline.
"When people think about pregnancy, they think about what happens to babies and the mother from the neck down, " said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida.
"They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently toward young. But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic alterations to the brain. \

What can protect the brain of a woman according to the passage

A. Estrogen.
B. The hormones of pregnancy.
C. More exercise.
D. Taking care of children.
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