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 questions from  $1$ to  $10.$
      It's a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researcher with the U.S Department of Agriculture's Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the $50$-to  $50$-kilohezt6 range. (The unaided human ear can detect no more than  $20$  kilohezt). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.
       The scientists think that the vibrations are created when the water columns inside tubes that run the length of the tree break, a result of too little water following through them. These fractured columns send out distinctive vibration patterns. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. "Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound", one scientist said.

$1.$ Which of the following is the main topic of the passage?
$A.$ the vibrations produced by insects
$B.$ the sound made by trees
$C.$ the mission of the U.S Forest Service
$D.$ the effect of insects on trees.

$2.$ The word them in line  $2$ refers to
$A.$ scientists          $B.$ trees          $C.$ vultures          $D.$ insects

$3.$ The word parched in line $5$ is closest in meaning to which of the following
$A.$ recovered          $B.$ burned          $C.$ damage          $D.$ dehydrated

$4.$ It can be inferred the passage that the sounds produced by the trees
$A.$ are the same no matter what type of tree produces them.
$B.$ cannot be heard by the unaided human ear.
$C.$ fall into the  $1-20$  kilohertz range.
$D.$ serve as a form of communication among trees.

$5.$ The word plight in the line  $5$ is closest in meaning to
$A.$ condition          $B.$ cry          $C.$ agony          need

$6.$ 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 colours

$7.$ Which of the following could be considered "a cause of the trees" distress signals of trees.
$A.$ lack of water            $B.$ attacks by insects
$C.$ experiments by scientist        $D.$ torn root

$8.$ It can be inferred from the passage that research concerning the distress signals of trees
$A.$ is no longer sponsored by the government.
$B.$ has been unproductive up to now.
$C.$ was conducted many years ago.
$D.$ is continuting.

$9.$ The word fractured in line  $8$  is closest meaning to
$A.$ broken          $B.$ hollow          $C.$ long          $D.$ blocked

$10.$ In line  $9$, the phrase "pick up"  could best be replaced by which of the following?
$A.$ attack          $B.$ lift          $C.$ transmit          $D.$ perceive

$1.B    2.B     3.D      4.B      5.A     6.D    7.A    8.A    9.D    10.D$

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