Khí X có tỷ khối so với hiđro bằng 22. X là khí nào trong các chất sau?
A.CO2.
B.N2.
C.Cl2.
D.CH4.

Which of the following is NOT true according to the passage?
A.City problems should be taught and be topic for students to discuss at school.
B.Children must ask for their parent’s permission before joining community efforts.
C.Participators might take part in different kinds of projects and campaigns.
D.People can contribute in solving the problems by writing to local organizations working on these issues.

Starting with (A), the foremost (B) problem engendered (C) by overpopulation is traffic congestion (D).
A.Starting with
B.foremost
C.engendered
D.congestion

It is imperative that all migrants _______ the regulations of the residential areas they move to.
A.must obey
B.would obey
C.will obey
D.should obey

I promise that I _____ late again.
A.am never
B.will never
C.am never being
D.will never be

Tơ nào sau đây thuộc loại tơ poliamit?
A.Tơ axetat.
B.Tơ nitron.
C.Tơ nilon-6,6.
D.Tơ visco.

Cho sơ đồ phản ứng: Xenlulozơ \(\xrightarrow[H^+,t^o]{H_2O}\) X \(\xrightarrow{{men}}\) Y \(\xrightarrow{{men}}\) Z \(\xrightarrow[H_2SO_4,t^o]{+Y}\) T. Chất T là
A.CH3-COOH.
B.CH3COOC2H5.
C.C2H5COOCH3.
D.C2H5COOH.

Mắc điện trở \(R = 2\Omega \) vào hai cực của nguồn điện không đổi có suất điện động , \(\xi  = 6V,\) điện trở trong \(r = 1\Omega \). Công  suất tiêu thụ ở mạch ngoài có giá trị
A.\(P = 6W\)
B.\(P = 12W\)
C.\(P = 4W\)
D.\(P = 8W\)

Souka Gakkai is a group of Buddists that ______.
A.has great power and influence in Japanese politics
B.separated from Buddhism in the 6th century
C.has a close connection with Zen Buddhism
D.consists of leading members of political parties in Japan

Ideally, I'd like to work at home but there is no way my boss agrees with that.
A.Generally
B.Luckily
C.Preferably
D.Fortunately