20．解析：　还有更多的孩子不得不照顾生病的父母和弟弟妹妹。take care of“照顾”符合语境。

　　答案：　BA、B、C和D中，选出最佳答案。

　　Many who need restorative rest most might not be able to get it.Why? 1.________ are in a hospital.Even at night，a hospital2.________ be a noisy place.And research has shown that these noise levels have been rising for decades.

　　A new study finds that electronic noises 3.________ particular interfere with sleep.

　　Researchers followed the sleep patterns of a dozen healthy volunteers 4.________ they spent three nights sleeping in a lab.Their hours of darkness were interrupted 5.________ fourteen different recorded hospital sounds played at varying volumes.Even when electronic sounds，6.________ alarm beeps(哔哔声)，were played at the level of a whisper，volunteers slightly woke from sleep.7.________ findings are in the journal Annals of Internal Medicine.

　　When the volunteers' sleep was disrupted，their heart rate increased frequently，8.________ could be bad for recovery.A little peace and quiet could make for a lot more restful nights.

　　(二)

　　1. They　考查代词。该空在句中作主语，指代上文提到的“Many who need restorative rest…”，故填they，首字母要大写。

　　2. can　考查情态动词。此空表示可能性，再根据句意“甚至在晚上，医院也可能是一个吵闹的地方”可知填can。

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