问题 选择题

以下哪一项不是种子萌发必要的环境条件(  )

A.一定的水分

B.充分的光照

C.充足的空气

D.适宜的温度

答案

种子萌发的条件有自身条件和环境条件;自身条件是指种子的胚是完整的、活的,并且已过休眠期,环境条件是指适宜的温度、充足的空气和充足的水分;大多数种子的萌发不需要光照.

故选:B.

阅读理解

One of the most famous scientists to study adaptations(适应能力) was Charles Darwin(达尔文). He was born in England in 1809. He wasn’t the best student in his school, but when he was 16, his father sent him to a medical school. Charles liked spending time outdoors observing(观察) nature more than having medical classes. He dropped out without graduating.

Next, Charles’ father sent him to school to become a minister(牧师). This time he made it to graduation, but he didn’t want to do the work of a minister. His friends encouraged him to follow his interest in science.

Luckily, Charles was invited to sail on the Beagle as an unpaid scientist after graduation. The Beagle was to travel to South America and then around the world. Their task was to make maps of the places they visited.

On December 27th, 1831. Charles Darwin sailed from England on the Beagle. The trip was planned to last two years. In fact, it lasted five. During this time, he saw many amazing things. He collected lots of plants and animals and took them back to England to begin his scientific study.

Twenty-three years later, Darwin published a scientific paper with another man named Wallace. Darwin described how some animals have adaptations that help them survive. They are passed on to offspring(后代). Darwin’s ideas about adaptations are still very important to the study of living things.

小题1:Darwin was very interested in ____________.

A.having medical classes

B.the work of a minister

C.sailing around the world

D.science and nature小题2:The trip on the Beagle lasted ____________ years.

A.five

B.four

C.three

D.two小题3:When Darwin published the scientific paper, he was ____________ years old.

A.twenty

B.twenty-three

C.forty-five

D.fifty小题4:The underlined word “they” in the last paragraph refers to ____________.

A.adaptations

B.Darwin and Wallace

C.animals

D.Darwin’s ideas

填空题