Bạc có 2 đồng vị $ {}^{109}Ag $ và $ {}^{107}Ag $ , thành phần phần trăm tổng số nguyên tử của đồng vị $ {}^{109}Ag $ là 44%. Nguyên tử khối trung bình của bạc là
A.106,316
B.107,88
C.1066,2
D.107,5

Bạc có 2 đồng vị, trong đó đồng vị $ {}^{109}Ag $ chiếm 44%, biết nguyên tử khối trung bình của bạc là 107,88. Số khối của đồng vị thứ 2 của nguyên tố X là
A.104
B.105
C.108
D.107

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
This guidebook can give you a brief overview of all ________________ of life in Vietnam.
A.retrospect
B.suspects
C.aspects
D.respect

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
What is the ___________ of Vietnam?- It’s Ao dai.
A.national costume
B.traditional dress
C.best outfit
D.customized clothes

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in the following sentence
Culture can bind people in a community because of the shared beliefs and values.
A.force
B.divide
C.engage
D.unite

Choose the word whose underlined part differs from the other three in pronunciation
A.caves
B.itineraries
C.memories
D.landscapes

Choose the word whose underlined part differs from the other three in pronunciation
A.endow
B.how
C.throw
D.flow

Choose the word whose underlined part differs from the other three in pronunciation
A.stones
B.thieves
C.places
D.ensures

Choose the word whose underlined part differs from the other three in pronunciation
A.located
B.wanted
C.visited
D.recognized

Choose the word whose underlined part differs from the other three in pronunciation
A.served
B.prepared
C.ranked
D.buried