Rapid ups and downs in the number of students could be observed in June.
A.The number of students changed dramatically in June.
B.The number of students did not stay the same in June.
C.The number of students fluctuated wildly in June.
D.The number of students went up and then fell in June.

Căn cứ vào Atlat Địa lí Việt Nam trang 19, cho biết tính nào trong các tỉnh sau đây có diện tích trồng cây công nghiệp hàng năm lớn nhất?
A.Bình Định.
B.Quảng Bình.
C.Quảng Nam.
D.Nghệ An.

\(A \cup B\)là một khoảng.
A.\(2 \le m < 3\).
B.\(2 < m < 3\).
C.\(2 \le m \le 3\).
D.\(2 < m \le 3\).

The woman said she______in this company for over 20 years.
A.has been working
B.was working
C.had been working
D.works

Which of the following sentences is not mentioned?
A.An unsociable person may not have a close friend.
B.Friendships need time to develop.
C.The ties of a close friendship will never be broken.
D.We often have satisfaction being with a close friend.

Nghiệm của đa thức \(P(x) = 2{\left( {x - 3} \right)^2} - 8\) là
A.\(x = 0\)
B.\(x = 5;x =  - 1.\)
C.Không tồn tại
D.\(x = 5;x = 1.\)

Disease, pollute, and limited distribution are factors that threaten various plant and animal species.
A.pollute
B.are
C.factors
D.threaten

When the robber pointed the gun to her head, she immediately did what he wanted.
A.On pointing the gun to her head, she immediately did what he wanted.
B.On pointing the gun to his head, she immediately did what he wanted.
C.She immediately did what he wanted when the gun pointed to his head.
D.When being pointed the gun to her head, she immediately did what he wanted.

A.begged
B.canned
C.booked
D.buttoned

Khi có \(n\)  nguồn giống nhau mắc nối tiếp, mỗi nguồn có suất điện động \(\xi \) và điện trở trong \(r\). Công thức đúng là:
A.\({\xi _b} = E;{r_b} = r\)
B.\({\xi _b} = \xi ;{r_b} = \dfrac{r}{n}\)
C.\({\xi _b} = n\xi ;{r_b} = nr\)
D.\({\xi _b} = n\xi ;{r_b} = \dfrac{r}{n}\)