Có bốn lọ hóa chất mất nhãn đựng riêng biệt bốn dung dịch muối AgNO3, C6H5ONa, Na2CO3 và NaNO3. Thuốc thử nào sau đây có thể được dùng để phân biệt các muối trên?
A.Dung dịch NaOH.
B.Dung dịch HCl.
C.Dung dịch K2S.
D.Cả B và C đều đúng.

Tìm số trung bình cộng.
A.\(8\)
B.\(9\)
C.\(9,57\)
D.\(8,57\)

Thiên tai có nguyên nhân từ sự thay đổi chế độ nước của sông là:
A.Lũ, lụt
B.Hạn hán
C.Bão
D.Động đất

Why was the Stuyvesant a limited success?
A.Most people could not afford to live there.
B.There were no shopping areas nearby.
C.The arrangement of the rooms was not convenient.
D.It was in a crowded neighborhood.

Congestion charging is a unique experiment that other UK cities are watching with interest; no other policies receive such public notice.
A.normal
B.formal
C.original
D.compulsory

His career in the illicit drug trade ended with the police raid this morning.
A.illegal
B.irregular
C.secret
D.loyal

Founded only three months ago, his company is still a comparable newcomer to the software market.
A.Founded
B.is
C.comparable
D.the software market

The children slept soundly because it was so_____ and quiet in the garden.
A.peaceable
B.peacefulness
C.peaceably
D.peaceful

\(\frac{{{x^2} - xy}}{{3{x^2} - 3xy}}\,\,\,\left( {x \ne 0,\,\,x \ne y} \right).\)
A.\( \frac{2}{3}.\)
B.1
C.\( \frac{1}{3}.\)
D.3

(27) …….
A.cultural
B.culture
C.traditional
D.tradition