题干

结合语境修改画线病句最恰当的一项是(  )
月球上特有的矿藏和能源,是对地球资源的重要补充和储备,对人类社会的可持续发展具有深远影响。科学考察探明,月球上已知矿物有一百多种,其中有五种地球上没有。月壤中还含有地球上少见的氦-3,它即使能在核聚变反应中释放巨大能量,也几乎不产生放射性污染,因此,被认为是二十一世纪的完美能源。

A:修改:它只要能在核聚变反应中释放巨大能量,就几乎不产生放射性污染

B:修改:它不但能在核聚变反应中释放巨大能量,而且几乎不产生放射性污染

C:修改:它要么几乎不产生放射性污染,要么能在核聚变反应中释放巨大能量

D:修改:它虽然几乎不产生放射性污染,但能在核聚变反应中释放巨大能量

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B

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    We all face quantities of stresses in day-to-day living, whether at work, in the home, or anywhere in between.____ Here's how stress can help us on an everyday basis.

    Sharpen your memory.

    Did you ever notice that sometimes when you are stressed, your memory seems to improve? Remember that test you passed where the answers seemed to come out of nowhere?____ It's because of stress hormones(荷尔蒙)that increase your alertness(机敏) when it's most needed.

    ____

    Successful employees turn stress into motivation. Have you ever noticed that you get the least amount of work done when you have the fewest deadlines? Too little stress can affect how much you actually get done. When you take risks and choose to get over the difficulty, it improves your mental toughness and self-confidence.

    Helping you resist the attack of illness.

    ____ Believe it or not, the right kind of stress can help your body's defenses against illness. When you get sick, stress causes you to make hormones that battle threats to your health. That burst of stress is helpful to your immune system when your body faces a threat.

    Making your life more interesting.

    Think about some stressful situations that we consciously put ourselves into make life more interesting and enjoyable, like asking someone out on a first date, conquering a known fear, or learning something new. These may not immediately come to mind when you think of stress because of the positive outcomes.____

A. Helping you get an advantage at work.

B. Helping you get through difficult times.

C. This will happen whenever you are stressed.

D. That's one way your brain responds to stress.

E. You need a healthy immune system to help fight off diseases.

F. But they're the types that can help you achieve fulfillment and happiness.

G.But handled properly,stress can have many benefits for the body and mind.