题目内容
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[单选题]
C4ISR系统中的“R”指的是（）。
A.指挥
B.情报
C.监视
D.侦察
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A．错误
B．正确
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第4题
Task 1
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Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice.
Walking is the easiest and simplest form. of exercise. By putting one foot in front of the other, you can start to walk your ways towards a healthier lifestyle. Walking is an easy way to challenge the cardiovascular system (心血管系统), while at the same time building muscles. But to achieve these goals, a little more than a gentle walk around the block is required.
Walking actually burns as many calories (卡洛里) as running the same distance —— if done in the correct manner and at a reasonable pace (步伐).
Start with a basic program that you can complete three or four times a week. This should include five main steps:
——A beginning warm-up for about 5 minutes.
——A little bit faster period of 5 minutes at medium level (中等速度)
——A 10-minute “burning” at a high level.
——A 5-minute cool down period at a low level again.
——A suitable walking pace of around 5 kilometers per hour will burn around 80 calories in 30 minutes.
According to the passage, walking is a simple way to______.
A．lose weight
B．avoid heart attacks
C．cure blood diseases
D．strengthen heart functions
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