2020 英语二

Rats and other animals need to be highly attuned to social signals from others so they can identify friends to cooperate with and enemies to avoid.

It is true that CEO pay has gone up — top ones may make 300 times the pay of typical workers on average, and since the mid-1970s, CEO pay for large publicly traded American corporations has, by varying estimates, gone up by about 500%.

Madrid was hailed as a public health guiding light last November when it rolled out ambitious restrictions on the most polluting cars.

Now that members of Generation Z are graduating college this spring — the most commonly-accepted definition says this generation was born after 1995, give or take a year — the attention has been rising steadily in recent weeks.