下列与细胞相关的叙述中正确的是( ) A . 蓝藻和黑藻含有的光合色素相同,都能进行光合作用 B . 动物细胞没有原生质层,因此不能发生渗透作用 C . 构成细胞膜的磷脂分子和大多数蛋白质是可以运动的 D . 衰老细胞的体积及细胞核体积都比正常细胞的小 答案:CHere is some news of the future.
March 20, 2035
There was a lot of news around the life extension
drugs that hit the market a decade ago. They didn't promise that you would like
forever, but they gave you a chance to extend your life an extra five to ten
years. Even though the life expectancy rate at birth has increased greatly, the
life expectancy for seniors hasn't improved that much. Basically, you have a
greater chance to become a senior, but you will not have a much longer
lifespan, and this is where the anti-aging drugs intend to kick in. So, do the
anti-aging drugs work? Well,it is too early to tell.
But the sales so far are very good.
April 19, 2035
Of the total US population of 378 million, people over
65 years of age now make up 20% for the first time. The senior ratio of only
4.1% by year 1900, and 12.4% 30 years ago.
The number of people above 65 compared to those of
what is considered working ages, between 15 and 64, is currently 33.7%. This is
up from 18.5% since year 2005, which means that for every retired person there
are now two workers, compared to four workers 30 years ago. The number of
people above the age of 80 has grown to 23.8 million, making them 6.3% of the
total population compared to 3.6% in 2005.
April 12, 2040
Although introduced in the market only five years ago,
10% of all hydrogen fuel now sold in the US is of the environmentally friendly
Re-Hydro label, produced through eletrolysis(电解)
based on a source of 100% renewable energy. Several producers have turned to
producing Re-Hydro, mainly because of lower tax, which also keeps the price of
Re-Hydro on the same level as regular hydrogen. Most analysts believe that
Re-Hydro will be the dominating fuel in the future.
1.According to News 1 we know that the life extension
drugs ____.
A.were first
sold in the year 2025.
B.are made to
make people live forever.
C.should be
taken when people are young.
D.have greatly
increased the life expectancy rate at birth.
2.The sales of the life extension drugs so far clearly
show that_____.
A.people have
no faith in them
B.people want
to give them a try
C.they work
very well for seniors
D.they have no
effect on people’s health
3.What can we learn from News 2?
A.Many
Americans will find it hard to find a job.
B.It’s very hard for seniors to pass the age of 80.
C.The US
population has been increasing rapidly since 2005.
D.The US
population has been aging rapidly since 2005.
4.We can know from the passage that the fuel of the
Re-Hydro label is ______.
A.expensive B.cheap C.green D.dangerous
5.What can we infer from News 3?
A.Re-Hydro will
be widely used in the future.
B.The
government discourages the production of Re-Hydro.
C.Producers are
not interested in producing Re-Hydro.
D.Re-Hydro is
more expensive than regular hydrogen.