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30.What does the writer expect teenagers to do according to the passage
A.On February 15.2022.
B.On February 21.2022.
A.Remain satisfied wit油their流.
C.On February 26,2022
D.On February 27.2022.
B.Forget about the past and focus on the present.
32.What may the underlined word"block"in Paragraph 3 mean
C.Study hard and make contributions to their motherland.
A.Help.B.Provide.C.Stop.
D.Change
D.Set a goal to be a great writer in the future.
33.Which of the following statement is TRUE
A.People have sent more than 3,000 active satellites into space now.
On February 21.2022 US company Space X sent 46 satellites()into space.Then six days
B.There are 22 satellites in the BeiDou Navigation Satellite System in all.
later,China sent sies ispace.Why do we need so many satellites What do they do for us
C.Satellites help emergency workers with predictions of changes in weather and climate.
At present therearmore than0 active satellites moving around Earth.Satellites have all
D.Before satellites,making phone calls to faraway places was easy
kinds of roles,from sending TV signals,giving you directions on the road,to helping scientists with
34.What's the structure of this pass
their research.For example.the 2 satellites China sent up are part of the BeiDou Navigation()
99
Satellite System.Shared bikes hatus BeDou chips can provide more correct positions,making them
easier to find
35.Which can be the best title for this passage
Before didn'treach very far.Mountains or tall buildings would block the
A.Where do people send satellites
B.What can satellites do for us
signals.Phone calls to faraway places were also a problem.Setting up telephone wires over long
C.How do people make satellites
D.When can we see satellites
With sigals and phone calls can be sent directly to a satellite and
D
back owtodifere pacesESpace Starlink project plans to use satellites to provide
Long ago,in ancient China,there was a story about the invention of silk.People believed that silk
people with the Intemet all over the world
was first invented by Leizu,the wife of the Yellow Emperor.Leizu leamned how to make cocoons()
into soft and strong cloth.This magical eloth became known as"silkand it asso valuable hitas
with predictions of chaneethrandcimBy watching and checking wildfires and volcanoes
called"China's Gold"Following kings'orders,the Chinese kept the secre of making silkfor e
()emergeny workers deal with natura disasters.Farmerscan use satellite pictures
But then,something amazing happened!During the Han Dynasty,the brave officer Zhang Qian
to decide the best tme towater their fields.
traveled west as far as Central Asia and brought silk there.As years passed bysilkbecmmrn
Some satelites fy near other panetsThey may look for waer on Mars or take close-up pictures
that the trade road from Europe to China got its namethe Silk Road.
of Satu's()ring.Video website Bilibili evateitinace to look at other planets
The Silk Road becamea busy highway for traders who carried mountains.
and share pictures and videos with Bilibili's users
From China.people sold silk and tea.In retum,they received easresuses()gold and
31.When did China send the
silver from the West.At the very beginning.it was mainly about trade:then people began to share

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