在十九大报告中，习 * * 强调，经过长期努力，我国发展站在了新的历史方位上，这个历史方位

Animals do many different, amazing things to get through the winter. Some of them migrate(迁徙). They travel to other places where the weather is warmer or where they can find food.

Many birds migrate in autumn. Because the trip can be dangerous, some travel in large groups. For example, geese(鹅) fly in noisy, “V”-shaped groups. Other kinds of birds fly alone.

Some animals stay active in winter. They must ___①___ themselves when the weather changes. Many change their doing or their bodies. For example, snowshoe rabbits grow white fur to help them hide in the snow.

Food is hard to find in winter. Some animals, ____②____ mice, collect lots of food in autumn and store it to eat later. Some animals eat different kinds of food as the seasons change.

Some animals sleep for part or all of the winter. The animal’s body temperature drops, and its heartbeat and breathing slow down so it uses very little energy. In autumn, these animals get ready for winter by eating much more food than in summer and storing it as body fat. They use this fat to keep them alive while sleeping.

Every type of insect（昆虫） has its own life cycle and that is the way it grows and changes. Different insects spend the winter in different forms of their lives. Some insects also spend the winter without moving. Some insects spend the winter as pupae（蛹）. Other insects die after laying eggs (卵)in autumn. ③The eggs change into new insects in spring and everything begins all over again。

小题1:在①、②空白处分别填入一个适当的词使句意完整、上下文通顺。

_____________  ______________

小题2:把③句译成中文。

_______________________________________________________________ 。

小题3: 回答问题: Which kind of bird flies in noisy, “V”-shaped groups?

________________________________________________________________ .

小题4:在文中找出与 “Snowshoe rabbits can hide themselves in the snow because of their white fur” 意思相近的句子，并将它写在横线上。

________________________________________________________________________________ .

小题5:在文中找出最能表达该短文主题的句子，并将它写在横线上。

________________________________________________________________________________.

A证券的标准差为12%，B证券的标准差为20%，若将它们等比组合后，组合的标准差为12.65%，则它们的相关系数为（）。

A．0.2

B．0.5

C．1

D．0.16

在自然界中，任何一种食物都不可能含有人体所需的各种营养素。

下列说法正确的是[ ]

A．需要加热才能发生的反应一定是吸热反应

B．任何放热反应在常温条件下一定能发生反应

C．反应物和生成物所具有的总能量决定了放热还是吸热

D．吸热反应在一定条件下(如常温、加热等)也能发生反应

协商式提醒是导游人员以商量的口气直接对旅游者进行的提醒方式。