下面说法中，正确的是（）。A、只有使用QQ才能进行视频聊天 B、发送的电子邮件会直接

我国政治体制改革必须坚持正确的政治方向，需要努力适应的是

A．我国人民政治参与的积极性不断提高

B．社会不断进步

C．经济不断发展

D．我国人民的政治觉悟不断提高

Have you thanked your grandma today? You might want to consider it. A recent study found that kids live longer when a grandmother takes part in their daily lives.

Most animals die soon after their childbearing years are over. Women, however, often live for many years after they stop having kids.

　To try to understand why, researchers from Finland looked at birth and death records of two communities from the 18th and 19th centuries, one in Finland and one in Canada. In these communities, 537 Finnish women and 3,290 Canadian women were grandmothers who had lived past the age of 50.

For every decade they lived beyond 50, the researchers found that the women ended up with an average of two extra grandkids. It didn’t matter what the differences in health or living conditions were between the two communities or from family to family.

Grandchildren were also more likely to live into adulthood if their grandmothers were alive when they were born. If their grandmothers were younger than 60 at the time, that was even better. The study also found that women had children 2 to 3 years earlier if their own mothers were still alive at that time than those whose mothers had died.

The researchers suggested that grandmothers have provided important assistance in raising their grandchildren for at least the past 200,000 years. As a result, they helped extend everyone’s lifespan.

So, don’t take your grandma for granted!

小题1:How many women in the survey in the two communities were grandmothers who had lived past the age of 50?

A．537.

B．3,290.

C．3,827.

D．2,753.小题2:According to the passage, what influence did it have on a woman if her mother was still alive?

A．She was also more likely to live into adulthood.

B．She had children 2 to 3 years earlier.

C．She ended up with an average of two extra grandkids.

D．It had no influence on her.小题3:How did grandmothers help extend everyone’s lifespan?

A．They provided them with better living conditions.

B．They provided assistance in raising their grandchildren.

C．They helped with housework.

D．They made everyone happy.小题4:According to the passage, we don’t know that _______.

A．kids live longer when grandmothers take part in their daily lives

B．most animals die soon after their childbearing years are over

C．women often live for many years after they stop having kids

D．grandchildren are less likely to live into adulthood if their grandmothers are alive

台试检验汽车制动力时，下面叙述正确的是（）。

A．空载或满载检测时，对制动力的要求都是相同的

B．“轴制动力”是指该轴左右轮最大制动力之和

C．前轮阻滞力不得大于5％，后轮阻滞力不得大于8％

标准齿轮分度圆上的齿厚等于齿槽宽。

少阴热化证的心烦不寐的病机是（）

A.邪热内盛

B.肝阳上扰

C.水亏火旺

D.上热下寒

E.热结胃肠