All the following are mentioned as possible factors in drawing insects to weakened trees EXCEPT  ________ .
A.thermal changes 
B.smells
C.sounds  
D.changes in colors

The word “parched” in paragraph 1 is closest in meaning to  _________  .
A.recovered 
B.burned 
C.damaged
D.dehydrated

____________ (55)
A.imagine
B.consider
C.think
D.examine

____________ (52)
A.efforts
B.tasks
C.achievements
D.result

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
I accepted the new job after all. It is making me feel exhausted.
A.Perhaps I shouldn’t have accepted this new job, as it’s making me feel exhausted.
B.Perhaps it would have been better if I hadn’t agreed to this new job since it is so boring.
C.It is of deep regret that I didn’t turn down the job offer due to its hardship and long hour work.
D.If it had not been for my acceptance the new job offer, I wouldn’t have felt exhausted.

Mark the letter A, B , C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.
It is unclear which agency will be responsible for cleaning the canal if it will become polluted again in the near future.
A.which agency
B.responsible
C.if it will become
D.polluted

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following question.
______ you like what I want to do or not, you won’t make me change my mind.
A.Whether                              
B.If                             
C.Because                 
D.When

The word “corruption” in paragraph 5 is closest in meaning to______
A.illegal activity
B.tolerance
C.government control
D.management

Which statement best summarizes the author’s point of view?
A.Ecotourism is a damaging trend that must be stopped.
B.Ecotourism is a way of protecting natural places.
C.Ecotourism causes some damage, but on the whole it benefits ecosystems.
D.Ecotourism will most likely become less popular in the future.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following question.
Water scarcity is fast becoming one of the major limiting factors in world crop production. In many areas, poor agricultural practices have led to increasing desertification and the loss of formerly arable lands: Consequently, those plant species that are well adapted to survival in dry climates are being looked at for an answer in developing more efficient crops to grow on marginally arable lands.
Plants use several mechanisms to ensure their survival in desert environments. Some involve purely mechanical and physical adaptations, such as the shape of the plant's surface, smaller leaf size, and extensive root systems. Some of the adaptations are related to chemical mechanisms. Many plants, such as cacti, have internal gums and mucilage which give them water-retaining properties. Another chemical mechanism is that of the epicuticular wax layer. This wax layer acts as an impervious cover to protect the plant. It prevents excessive loss of internal moisture. It also protects the plant from external aggression, which can come from inorganic agents such as gases, or organic agents which include bacteria and plant pests.
Researchers have proposed that synthetic waxes with similar protective abilities could be prepared based on knowledge of desert plants. If successfully developed, such a compound could be used to greatly increase a plant's ability to maintain health in such adverse situations as inadequate water supply, limited fertilizer availability, attack by pests, and poor storage after harvesting.

This passage deals mainly with _________.      
A.desertification                                                  
B.developing efficient plants
C.factors limiting crop production   
D.decreasing water supply