2016年2月26日，十二届全国人大常委会在北京人民大会堂首次举行宪法宣誓仪式，领誓人、新任命的全国人大财政经济委员会副主任委员刘源走到宣誓台前，将左手抚按在宪法上，右手举拳，宣读誓词，其他五名新任命的全国人大常委会工作委员会副主任并排站在领誓人身后，举起右手，跟读誓词，举行宪法宣誓仪式（    ）

①源于宪法是一切国家机关、团体组织和全体公民的最高行为准则   ②有利于用宪法代替普通法律、充分发挥宪法的作用

③能激励和教育国家工作人员忠于宪法、遵守宪法、维护宪法           ④符合依法治国基本方略的要求

    Earth Day is an event ____ (annual) celebrated on April 22.____ (found) by Senator Gaylord Nelson, an American politician and environmentalist, it was originally aimed at helping the public to know the current situation of pollution and ____ (get) people to care about the earth.

    In 1962, Rachel Carson's bestseller “Silent Spring” created an ____ (aware) of the dangerous effects of pesticides(农药）. Then, a fire,____broke out in 1969 on Cleveland's Guyahoga River, revealed the problem of chemical pollution in water. Senator Gaylord Nelson dreamed of____similar event that would get people to take environmental issues seriously. In 1969, he was inspired by protests against the Vietnam War and came up with the idea for Earth Day.

    In the fall of 1969, Nelson announced it and appealed to the entire country to get involved. Consequently, telegrams, letters and telephone calls ____ all over the country poured in. Since 1970, Earth Day celebrations have grown. Later, Nelson____(award) the Presidential Medal of Freedom because of his work.

    Today, numerous communities celebrate Earth Week, an entire week of____(activity) focused on the environmental issues. In 2017, the March for Science ____(occur) on Earth Day and was followed by the People's Climate Mobilization on April 29.

体育比赛中运动员一旦受伤，医生会对着受伤部位喷射一种叫氯乙烷的药液，该药液会在皮肤表面迅速汽化，使受伤部位表层骤然变冷而暂时失去痛感．这说明氯乙烷具有较低的（  ）