What is a serious problem of Lake Baikal in Russia?
A.It contains a rich variety of animals and plants
B.It is polluted by massive volumes of industrial wastes discharged into it.
C.It has 1,300 rare species that do not exist anywhere else in the world
D.The government did not have the power to enforce laws and regulations

Which of the following is NOT the reason that makes water undrinkable?
A.acid   rain
B.garbage
C.industrial  pollution
D.high cost

One environmental problem in the world  today is   
A.acid   rain
B.safe water shortage
C.industrial  pollution
D.. population explosion

Read the passage and answer the questions that follow:
Tropical rainforests are found in Amazon region of South America, Central America, and South and Southeast Asia. Rainforests are very important to the world’s climate. The Amazon rainforest alone  receives about 30 to 40 percent of the total rainfall on the earth and produces about the same percentage of the world’s oxygen. Some scientists believe that the decreasing size of rainforests will affect the climate on the earth, making it uncomfortable or even dangerous for life. Saving our rainforests is an international problem. One country or even a few countries cannot solve the problem alone. The nations of the world must work together to find a solution before it is too late.
Is saving our rainforests the problem of one country?
A.
B.
C.
D.

Read the passage and answer the questions that follow:
Tropical rainforests are found in Amazon region of South America, Central America, and South and Southeast Asia. Rainforests are very important to the world’s climate. The Amazon rainforest alone  receives about 30 to 40 percent of the total rainfall on the earth and produces about the same percentage of the world’s oxygen. Some scientists believe that the decreasing size of rainforests will affect the climate on the earth, making it uncomfortable or even dangerous for life. Saving our rainforests is an international problem. One country or even a few countries cannot solve the problem alone. The nations of the world must work together to find a solution before it is too late.
What do some scientists believe?
A.
B.
C.
D.

Read the passage and answer the questions that follow:
Tropical rainforests are found in Amazon region of South America, Central America, and South and Southeast Asia. Rainforests are very important to the world’s climate. The Amazon rainforest alone  receives about 30 to 40 percent of the total rainfall on the earth and produces about the same percentage of the world’s oxygen. Some scientists believe that the decreasing size of rainforests will affect the climate on the earth, making it uncomfortable or even dangerous for life. Saving our rainforests is an international problem. One country or even a few countries cannot solve the problem alone. The nations of the world must work together to find a solution before it is too late.
How much percent of the world’s oxygen does the Amazon rainforest produce?
A.
B.
C.
D.

Read the passage and answer the questions that follow:
Tropical rainforests are found in Amazon region of South America, Central America, and South and Southeast Asia. Rainforests are very important to the world’s climate. The Amazon rainforest alone  receives about 30 to 40 percent of the total rainfall on the earth and produces about the same percentage of the world’s oxygen. Some scientists believe that the decreasing size of rainforests will affect the climate on the earth, making it uncomfortable or even dangerous for life. Saving our rainforests is an international problem. One country or even a few countries cannot solve the problem alone. The nations of the world must work together to find a solution before it is too late.
Do rainforests play an important role in the world’s climate?
A.
B.
C.
D.

Read the passage and answer the questions that follow:
Tropical rainforests are found in Amazon region of South America, Central America, and South and Southeast Asia. Rainforests are very important to the world’s climate. The Amazon rainforest alone  receives about 30 to 40 percent of the total rainfall on the earth and produces about the same percentage of the world’s oxygen. Some scientists believe that the decreasing size of rainforests will affect the climate on the earth, making it uncomfortable or even dangerous for life. Saving our rainforests is an international problem. One country or even a few countries cannot solve the problem alone. The nations of the world must work together to find a solution before it is too late.
Where are tropical rainforests found?
A.
B.
C.
D.

Choose the word, phrase or expression that best completes each sentence below:
Trang: “ Would you like something to eat, Ha?”          Ha”_______. I’m full”
A.Great
B.No, thanks
C.Good idea
D.My pleasure

Choose the word, phrase or expression that best completes each sentence below:
I like to visit Viet Nam _______Vietnamese people are very friendly
A.so
B.but
C.because
D.though