40天攻克大学英语四级·冲刺模拟五套题-【免费下载】(8)

40天攻克大学英语四级,共6个分册。拿出来和大家分享下。

57. ____ by the police, the kidnappers had no choice but to surrender.

A) Surrounded B) Surrounding

C) Having surrounded D) To be surrounded

58. The international situation is very _______ in the Middle East.

A) delicious B) perfect C) delicate D) permeate

59. Don’t hang ______ the window. It’s dangerous.

A) out B) out of C) off D) from?

60. We _______ that it will take another four months to finish this plan.

A) grant B) estimate C. back D) guarantee

Part IV Cloze (15 minutes)

Directions: There are 20 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage. Then mark the corresponding letter on the Answer Sheet with a single line through the centre. If you stand a short distance away from a high wall and shout, your voice sometimes comes back to you as an echo. This happens because the 61 waves are reflected

62 the wall. This is the principle of radar, 63 instead of sound it is radio waves which are reflected. This 64 was made a few years before the last war, 65

radio waves from a transmitting station 66 reflected back from a distant aeroplane. It was realized 67 an apparatus could be devised to send out radio waves

68 and record the 69 from any approaching aeroplanes, it would be a wonderful method of defense 70 war.

Scientists 71 solving the problem and radar was 72 . An apparatus was made which sent out waves in pulses, and the presence of a distant aeroplane was shown on the screen of a cathode（阴极）ray tube, (this is 73 we have in a television set).

74 this way radar stations could detect the approach of enemy aircraft.

After the war radar was put to peaceful uses. It is now installed at airports to 75 aeroplanes down safely in fog. It is fitted to ships so that they are warned 76 obstr- uctions ahead, 77 icebergs. It guides ships into port. It provides aeroplanes and ships 78 a magic eye, with 79 they can see 80 into the distance, in the dark or in fog.

61. A) voice B) sound C) shout D) echo

62. A) off B) on C) in D) against

63. A) so B) on C) but D) as

64. A) found B) discover C) knowledge D) discovery

65. A) when B) as C) until D) before

66. A) was B) were C) is D) are

67. A) if that B) if when C) that if D) when if

68. A) all time B) every time C) any time D) all the time

69. A) echoes B) voices C) sounds D) waves

70. A) on B) in C) at D) off

71. A) set off B) set aside C) set up D) set about

72. A) found B) seen C) made D) invented

73. A) what B) that C) which D) that

74. A) On B) Upon C) In D) Along

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