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  3. Forty-three percent of Americans say they are too tired to function. So, some mornings, you might even【C1】________staying in bed

Forty-three percent of Americans say they are too tired to function. So, some mornings, you might even【C1】________staying in bed

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问题     Forty-three percent of Americans say they are too tired to function. So, some mornings, you might even【C1】________staying in bed forever. Hey, look, your wish【C2】________! You’ve got everything you need in bed and don’t have to move again. But it won’t be long before you realize that you’ve made a big【C3】________.
    People spend【C4】________Sundays or sick days in bed all the time and are no worse for wear, but if you don’t start moving again after 24 hours, one of the first things to change is your lungs. Gravity isn’t pulling them down into their normal position anymore, so the lower part of your lungs will【C5】________up. You probably won’t feel any different, but watch out, because it’s harder for mucus to pass【C6】________those collapsed passages. So it can get trapped, which can【C7】________ your lungs and ultimately lead to pneumonia.
    Normally, your bones and muscles help【C8】________your weight under gravity. But now that you’re lying down, they’re out of a(n)【C9】________. And as the saying【10】________. if you don’t use them, you lose them. For every week in bed, you lose about 1% of your bone density, making your bones more brittle and easy to【11】________. That’s why astronauts, who often go for months without gravity, exercise for at least 2 hours a day and【12】________calcium. In that same week, you also lose 1% of your muscle mass, 【13】________in your thighs, butt and shoulders, which you’re no longer using.
    【14】________, your brain isn’t a happy camper either. After all, you’ve been【15】________in the same room for months, staring at the same walls, the same spot on the ceiling, having the same experiences day after day. Not great for mental health, to say the【16】________. A study of pregnant women found that bed rest increased their【17】________of anxiety and depression, and some women reported feeling【C18】________ . out of control and imprisoned.
    So, a year of【19】________bed rest is not the relaxing paradise we’d all dream it’d be. Just keep in mind: There’s nothing wrong with a lazy Sunday morning, 【20】________you’re up and moving before Monday strikes.
【C20】
选项 A、but
B、although
C、while
D、provided
答案 D
解析 空格处需要填入一个连词，将前后两个句子连接起来，前一句是主句，意思是：“周日早晨慵懒一些没有什么问题”，后一句是从句，意思是：“你在周一到来前动起来”。本文第二段的首句说：“人们总是在慵懒的周日或生病时一直躺在床上，这并不会让人筋疲力尽”，全文也在说长时间的卧床是不健康的。由此可知本句后面的分句表示的是条件，四个选项中，满足要求的只有选项[D]provided。provided相当于if，意思是“只要，如果”，例如：You can still get health care，provided you pay the cost yourself．(只要你自己付钱，你仍然可以得到医疗保健服务。)故选项[D]是答案。
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