Mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following questions.

Before he went on vacation, Peter left explicit instructions for the decoration of his office.

A. clear                 

B. colorful            

C. vague               

D. direct

Read the passage and choose the best option to complete each blank.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes ____(46)___ ecosystems. If there is too little rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals____(47)___feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fires for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ____(48)___. Polluting the air, soil, and water can harm ecosystems. Building dams on rivers for electric power and irrigation can harm ecosystems ____(49)___ the rivers. Bulldozing wetlands and cutting down forests destroy ecosystems. Ecologists are working with companies and governments to find better ways of ___(50)____ fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people without causing harm to ecosystems 

Điền ô số 50

A. catching

B. holding

C. carrying

D. taking

Phân tử mARN trướng thành dài 408 nm có tỉ lệ các loại nu A : U : G : X = 4 : 2 : 3: 1 và mã kết thúc là UGA. Khi tổng hợp một chuỗi polipeptit, số nucleotit có ở các đối mã của tARN loại A, U, G, X lần lượt là:

A. 479, 239, 359, 120. 

B. 239,479, 120, 359.

C. 480 239, 359, 119. 

D. 479, 239 360 119.

A quick look would reveal that France has twice______computers

A. more televisions than    

B. many as televisions as  

C. as many televisions as    

D. as many as televisions