New words：

spring [spriŋ]
v.跳；跃；蹦；突然猛烈地移动
n.春天；弹簧；发条；跳

sprang [spræŋ] 过去式
sprung [sprʌŋ] 过去分词

Sample Sentences：

There's little spring in this sofa.
The cat made a spring at the mouse.

The dog tried to spring over the gate.
Suddenly a rabbit sprang out of its cave.
He turned off the alarm and sprang out of bed.

New words：

drift [drift]
v.漂移；漂流；飘；缓缓移动
n.趋势；漂流；趋势

iceberg ['aisbə:g] n. 冰山

Sample Sentences：

Clouds drifted across the sky.
I'm sorry, I got bored and drifted off.
There was a drift of smoke above the trees.
Most of the iceberg is under the water.
The Titanic sank after hitting an iceberg in the early morning hours of April 15, 1912.

New words：

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

Sample Sentences：

You will endanger your health if you smoke.
We should do our best to save endangered species.
The drift of the icebergs in the sea endangers the ships.
That one mistake seriously endangered the future of the company.

iceberg ['aisbə:g] n. 冰山

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