江西省2020届高三英语二轮专项训练 阅读理解(53)

江西省

2020

届高三英语二轮专项训练：阅读 理解（

53

）

阅读下列短文，从每题所给的四个选项（

A

、

B

、

C

和

D

）中，选出最佳选项，并在答< /p>

题卡上将该项涂黑。

A

Can

people

change

their

skin

color

without

suffering

like

pop

king

Michael

Jackson? Perhaps ists have found the gene that determines skin

color.

The gene comes in two versions, one of which is found in 99 per cent of

other

is found in 93 t0 100 per cent of Africans, researchers

at Pennsylvania State University report in the latest issue of Science.

Scientists have changed the color of a dark - striped zebrafish(

斑马

鱼

) to uniform gold by inserting a version of the pigment(

色素

) gene into

a

young

with

humans,

zebrafish

skin

color

is

deter- mined by

pigment

cells

，

which contain melanin(

黑色素

).The number, size and darkness of

melanin perpigment cell determine skin color.

It appears that, like the golden zebrafish, light - skinned Europeans

also

have

a

mutation

(

变异

)

in

the

gene

for

melanin

results

in less pigrnented skin.

However, Keith Cheng, leader of the research team, points out that the

mutation is different in hu-man ancl zebrafish genes.

Humans acquired dark skin in Africa about l.5 million years ago to protect

bodies from ultra - violetrays of the sun. which can cause skin cancer.

But when modem humans leave Africa to live in northem latitudes, they

need more sunlight on their skin to produce vitamin D. So the related gene

changes, according to Cheng.

Asians have the same version of the gene as Africans, so they probably

acquired

their

light

skin

through

the

action

of

some

other

gene

that

affects

skin color, said Cheng.

The new discovery could lead to medical treatments for skin

also

could

lead

to

research

in-to

ways

to

change

skin

color

without

damaging

it like chemical treatment did on Michael Jackson.

ists have done an experiment on a dark -striped zebrafish in order

to

the different genes o humans'

the humans' skin color is determined by the pigment gene

out the reason why the Africans' skin color is dark

out the ways of changing people's skin color

can be inferred from the passage that .

ys people who want to change their skin color have to suffer 8

lot from the damage caused by the chemical treatment

ans and Africans have the same gene

new

discovery

could

help

to

find

medical

treatments

for

skin

cancer

are two kinds of genes

passage mainly tells us that .

ists have found out that people's skin color is determined by

the gene

new

discovery

could

lead

to

research

into

ways

to

change

skin

color

safely

C. pop king Michael Jackson often changed his skin color as he liked

can not change their skin color without any pain

reason why Europeans are light - skinned is probably that .

are bom light - skinned people

-

skinned

Europeans

have

mutation

in

the

gene

for

melanin

production

C. th

ey have fewer activities outside

pay much attention to protecting their skin

writer's attitude towarcls the discovery is .

l

B

One

Tuesday

evening

in

the

beginning

of

the

fall

1996

semester

at

Shippensburg University, sirens(

警笛

) sirens were not in

celebration; they were a cry to the university that something was wrong.A

house, only one block away, was on of the university's students

lived there.

From the minute the word got out that help was needed, it seemed like

everyone

showed

victims

of

the

fire

were

offered

endless

invitations

for housing for the very next day, everyone got into gear to do

their

part

in

helping

(

小传单

)

were

posted

with

items

that

were

immediatelyneeded, just to get these students through this next couple of

for donations and money jarswere placed in every residence hall

（学生宿舍）

．

As a residence director

，

I went before the students in my hall to ask

them

to

do

what

they

could.I

knew

that

college

students

don't

have

much,

but

I

asked

them

to

clo

their

best:

“

Every

little

bit

will

help.

I

really

didn't

think they could do proved wrong.

At

the

hall

council

meeting

the

night

after

the

fire,

my

residents

decided

to have a wing competition,where each wing of the building would team up to

see who could bring in the most donations.l the wing who won

ve

erent

ve

would receive a free pizza party.

Thursday evening we announced over the PA system that we were beginning

the

wing

minutes,

the

place

single

large

box

that I had placed in the lobby (

太厅

) was quickly grabbed

more

boxes,

and

we

watched

in

amazement

as

they,

too,

filled

to

the

s

of

the

resident

assistant

staff

and

I

began

t.o

count

the

items.l

was astonished by what I saw, andI was inspired by these kids.

When we came to the final tally

（得分）

, the winners tumed to me and

announced

that

they

would

like

to

donate

their

winnings

as

wanted

the victims of the fire to have their pizza party.

Tears

welled

up

in

my

eyes.I

had

watched

these

students

jump

to

action,

work

tirelessly

and

donateall

that

they

then,

as

if

that

were

not

enough,

they handed over their reward.l was touchedand so very proud of them.

writer mainly wanted to by the story.

us the suffering of nine of the college students from a fire

the college students helping the victims selflessly

us how successful the wing competition was

he was deeply moved by the college students' action

phrase

eager

B. take action

C. be prepared

working

first, the residence director thought .

was impossible to expect the college students to donate anything

was easy to collect a lot of donations from the college students

college students would donate not much

college students would donate all the items they had

wing competition was held .

Tuesday evening

B. on Thursday

very next day

Wednesday evening

did the resi ence director feel when he saw the brimful boxes?

le

．

C

The

United

States

is

already

one

year

into

a

depression

That

was

the

news

this week from the Na-tional Bureau of Economic Research. The downturn is

the

longest

since

a

depression

that

began in

1981and

lasted

sixteen

months.

Economists generally wait for production to shrink for six months in a

row before they declare a re-cession. But the bureau, a private group, uses

a wider set of information to measure the economy. Thenews only confirmed

what many people already knew: that the world's largest economy is weak and

maynot recover soon.

Worsening conclitions have led to a big drop in spending, especially on

costly

products

like

new

cars.

Even

Japanese

automaker

Toyota

saw

its

sales

fall

thirty

-

four

percent

in

the

United

States

in

November

from

a

year

ago.

The heads of Chrysler, Ford and General Motors retumed to Congress this

week to again ask for federal aid. Congressional leaders denounced(

指责

)

them two weeks ago after they came in private jets with no clear plans for

saving their industry. This time, the chiefs drove to Washington in fuel-

saving

hybrid

vehicles.

And

their

companies

presented

detailed

restructuring

plans. The reguest for aid has risen from twenty-five billion dollars two

weeks ago to thirty-four billion in loans and credit lines.

G.M. wants almost half of that, and says it needs four billion dollars

this month. It warned that without support it cannot continue to operate.

Ford

is

in

a

better

position,

But

the

sharing

of

suppliers

means

it

could

be affected if G.M. or

．

sed

．

D

．

Serious