中世纪的女人们认为，在私人领域以外，必须把头发藏好，要用帽子、头巾保护起来。文艺复兴时期的女人们则用白色或黄色的蚕丝做成假发装饰品，在阳光灿烂的日子里整天在露天中度过。这表明文艺复兴的重要特征是(    )

一个小球被抛出后，距离地面的高度h（米）和飞行时间t（秒）满足下面函数关系式：$h=-5{\left(t-1\right)}^2+6$，则小球距离地面的最大高度是（  ）.

下列有关美国独立战争和南北战争共同影响的描述，正确的是(     )

    James Cook, at the age of forty, was sent by England to explore the Pacific Ocean. On his third voyage, as captain in charge of two ships, the Discovery and the Revolution, he came upon a group of unknown islands which he named the Sandwich Islands after his friend, the Earl (伯爵) of Sandwich. Today the islands are known at the Hawaiian Islands.

    When Cook sailed into a protected bay (海湾) of one of the larger islands, the natives greeted him with curiosity and respect. Some historians said that the islanders welcomed him, believing he was the god, protector of peace and agriculture.

    The islanders were short, strong people with a very well-organized social system. The men fished and raised crops. The women prepared for the children and made clothing for the men and short skirts for the women.