Cho hai đa thức: $ M=3,5{{x}^{2}}y-2x{{y}^{2}}+1,5{{x}^{2}}y+2xy+3x{{y}^{2}} $
$ N=2{{x}^{2}}y+3,2xy+x{{y}^{2}}-4x{{y}^{2}}-1,2xy $
Thu gọn đa thức $ M+N $ ta được
A. $ 7{{x}^{2}}y-2x{{y}^{2}}-4xy $ .
B. $ -3{{x}^{2}}y-x{{y}^{2}}-3xy $ .
C. $ 7{{x}^{2}}y-2x{{y}^{2}}+4xy $ .
D. $ 7{{x}^{2}}y-x{{y}^{2}}-4xy $ .

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Nam is really interested ………. environmental impacts.
A.in
B.of
C.at
D.on

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Air pollution, the greenhouse effect and global warming have a negative impact ………. the environment.
A.of
B.on
C.from
D.in

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
We should ………. our Earth from many threats such as deforestation, pollution and fossil fuel depletion.
A.protector
B.protection
C.protective
D.protect

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
He _____ that we could buy reusable bags and leave them in our car for shopping.
A.said us
B.said
C.says to us
D.told to us

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Thomas ……….about environmental pollution for his school newsletter at the moment.
A.will write
B.has written
C.writes
D.is writing

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The rhino habitat has been perfectly ………. in the region.
A.preserving
B.preserve
C.preserved
D.preservation

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Water pollutants are things such as detergents, pesticides and rubbish blockages in river that make the water unclean and ……….
A.contaminated
B.contamination
C.contaminate
D.contaminating

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Any amateur gardener knows plants need two things to ……….: sunlight and water.
A.survivor
B.surviving
C.survival
D.survive

Ngay sau chiến thắng Cầu Giấy lần thứ nhất (1874), triều đình Huế đã ký với Pháp bản Hiệp ước
A.Nhâm Tuất.
B.Patơnốt.
C.Hácmăng.
D.Giáp Tuất.