New words：

species ['spi:ʃi:z] n. 种；物种；种类

Sample Sentences：

There are several species of zebra.
This species of bird now exists only in Africa.
This rare bird has become an endangered species.

endanger [in'deindʒə] v. 危害；使遭危险；危及
endangered [in'deindʒəd] adj. 濒临灭绝的

New words：

humor ['hju:mə] n.幽默
sense of humor 幽默感
humorous ['hju:mərəs] adj. 幽默的；好笑的；诙谐的

humorless ['hju:məlis] adj. 缺乏幽默感的；严肃的
inhumorous [in'hju:mərəs] adj. 不幽默的;不滑稽的

Sample Sentences：

Unlike his brother, he has a good sense of humor.
Humor is one of the greatest gifts our species has been given.

He had a wide mouth and humorous grey eyes.
He was quite humorous, and I liked that about him.

species ['spi:ʃi:z] n. 种；物种；种类

New words：

loose [lu:s]
adj.松的；宽松的；未固定牢的；可分开的
v.松开；释放；放任

Sample Sentences：

She is wearing a loose dress.
Some loose pages fell out of the book.
Never tell him a secret; he's got a loose tongue.
She helped the child loose the laces of his shoes.

New words：

ankle ['æŋkl] n.踝；踝关节

Sample Sentences：

She turned her ankle while ice-skating.
She stepped on a loose stone and twisted her ankle.
She broke her ankle weeks ago and it's still in plaster.

loose [lu:s] adj. 松的；宽松的；未固定牢的；可分开的

New words：

sparrow ['spærəu] n. 麻雀

Sample Sentences：

The boy has got a hen sparrow.
The sparrow is a common bird in our city.
I can see a sparrow flying in the distance.