Lưỡng cư có bao nhiêu vai trò dưới đây:
(1). Lưỡng cư có ích cho nông nghiệp.
(2). Lưỡng cư có giá trị thực phẩm.
(3). Làm vật thí nghiệm.
A.0.
B.2.
C.1.
D.3.

Choose the answer among A, B, C, D to complete each of the sentences below:
The Vietnam Society of Learning Promotion started a campaign ______ illiteracy eradication.
A.on
B.for
C.in
D.of

Choose the answer among A, B, C, D to complete each of the sentences below:
In spite of all its ______, medical science knows little about the brain.
A.advantages
B.approaches
C.advances
D.advents

Lớp lưỡng cư được phân làm mấy bộ chính?
A.5 bộ.
B.6 bộ.
C.4 bộ.
D.3 bộ.

Đại diện nào dưới đây có cấu tạo ngón chân có giác bám lớn?
A.Ếch giun.
B.Ếch cây.
C.Cá cóc Tam Đảo.
D.Cóc nhà.

Choose the answer among A, B, C, D to complete each of the sentences below:
We could make better ______ of our energy resources.
A.use
B.limit
C.need
D.spend

Choose the answer among A, B, C, D to complete each of the sentences below:
I don't know the title but I recognize the _____ of this song.
A.tune
B.theme
C.rhyme
D.sound

Choose the answer among A, B, C, D to complete each of the sentences below:
The campaign will hopefully ensure the survival ______ the tiger.
A.to
B.of
C.on
D.for

Choose the answer among A, B, C, D to complete each of the sentences below:
We moved to the countryside for some ________.
A.happiness and enjoyment
B.comfort and advance
C.peace and quiet
D.freedom and pleasure

Choose the answer among A, B, C, D to complete each of the sentences below:
Schools need ______ to help children to read and write.
A.volunteers
B.pioneers
C.engineers
D.innovators