Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Pollution and heavy traffic are common problems in _________ cities.
A.rural
B.remote
C.overcrowded
D.quiet

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Researchers are developing low-cost devices that can _________ water pollutants in rivers and lakes.
A.enhance
B.detect
C.carry
D.warning

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
My father is very optimistic about the future of our city. He believes the government will use _________ to solve the pollution problems successfully.
A.advanced technology
B.facility
C.environment
D.infrastructure

Tam giác cân có bao nhiêu tâm đối xứng?
A.3
B.0
C.2
D.1

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Farmers should use _________ methods to produce clean and healthy food.
A.rural
B.sustainable
C.urban
D.renewable

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
I think the use of fossil fuels _________ pollution.
A.suggests
B.leads
C.causes
D.results

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Many researchers claim that yoga practice and physical activities can improve people’s _________.
A.inhabitants
B.facilities
C.quality of life
D.infrastructure

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Local authorities should find ways to limit the use of private cars and encourage _________ to use public transport.
A.city dwellers
B.infrastructure
C.facilities
D.environment

Giả sử ${{D}_{I}}(M)=M'$. Khi đó mệnh đề nào sau đây là sai?
A..$\widehat{MIM'}={{0}^{o}}$.
B..$ \vec{IM}=- \vec{IM'}$.
C..${{D}_{I}}(M')=M$.
D..$ \vec{MM'}=2 \vec{IM'}$.

Trong xináp, chất trung gian hóa học nằm ở
A.màng sau xináp.
B.màng trước xináp.
C.chùy xináp.
D.khe xináp.