front and back-are said to act in opposition to each other. When one set is wor king the other set is usually relaxed But there are times when both of them wor k Sometimes muscles are called upon to do more than simply pull in one direction They may have to perform a turning motion. To be able to do this, the muscle mus t be attached to the bone at an angle. By pulling the muscle can cause the bone to pivot 31. According to the passage, movement occurs when a muscle A)grows B)shortens Relaxes D)pushes 32. The point at which a muscle is attached to the bone that moves is called the A)source B)insertion C)tendon D)diaphragm 33. The phrase"called upon"in line 12 is closest in meaning to which of the following? A)Required. B)Visited C)Permitted. D)Subjected 34.The passage implies that reversing the muscle-bone movement used to bend an arm requires A)the relaxation of two sets of muscles B)the use of different muscles C)a different kind of tissue D)the enlargement of the muscle 35. Why are some muscles attached to bones at an angle? A)To cause the muscles to push B)To strengthen the muscles C)To shorten tissue D)To perform a turning action Passage 4 Questions 36 to 40 are based on the following passage. Of the tens of thousands of ships on the ocean bottom, only a handful, less than 1 percent, contain negotiable treasure, such as gold and jewels. Most give us a different priceless treasure-history. a sunken ship lies in trust, preserved in the airless environment of the sea, and those in deep water are especially welfront and back—are said to act in opposition to each other.When one set is wor king ,the other set is usually relaxed.But there are times when both of them wor k.Sometimes muscles are called upon to do more than simply pull in one direction .They may have to perform a turning motion.To be able to do this ,the muscle mus t be attached to the bone at an angle.By pulling, the muscle can cause the bone to pivot. 31.According to the passage,movement occurs when a muscle____ . A)grows B)shortens C)relaxes D)pushes 32.The point at which a muscle is attached to the bone that moves is called the ____ . A)source B)insertion C)tendon D)diaphragm 33.The phrase“called upon”in line 12 is closest in meaning to which of the following? A)Required.B)Visited. C)Permitted.D)Subjected. 34.The passage implies that reversing the muscle-bone movement used to bend an arm requires____ . A)the relaxation of two sets of muscles B)the use of different muscles C)a different kind of tissue D)the enlargement of the muscle 35.Why are some muscles attached to bones at an angle? A)To cause the muscles to push. B)To strengthen the muscles. C)To shorten tissues. D)To perform a turning action. Passage 4 Questions 36 to 40 are based on the following passage. Of the tens of thousands of ships on the ocean bottom,only a handful,less than 1 percent,contain negotiable treasure,such as gold and jewels.Most give us a different,priceless treasure—history.A sunken ship lies in trust,preserved in the airless environment of the sea,and those in deep water are especially well