问题 选择题

现代大爆炸理论认为:天然元素源于氢氦等发生的原子核的融合反应.这于一百多年前,普鲁特运用思辨性推测作出“氢是所有元素之母”的预言,恰好“一致”.下列说法正确的是(  )

A.科学研究中若能以思辨性推测为核心,就能加快科学的进程

B.普鲁特“既然氢最轻,它就是其他一切元素之母”的推理是符合逻辑的

C.“一致”是巧合,普鲁特的预言没有科学事实和理论支撑,只是一种猜测

D.“现代大爆炸理论”是解释宇宙诞生的唯一正确的理论

答案

答案:C

阅读理解

Most people have heard the sound of bees among flowers. Bees live almost everywhere in the world except in the Arctic areas.

Many kinds of agriculture depend on these small, social insects. Without bees, fruit and nut growers as well as many other farmers would not have a crop.

There are more than 20,000 kinds of bees. But only honey bees make enough honey for people to use. Honeybees are highly-organized social insects. They work together in a group, called a colony(群体). Each colony lives in a hive(蜂房). It contains one queen bee -- she lays all the eggs from which the members of the colony come. Each colony has only a few hundred males, called drones. The majority of all bees in a colony are workers, which are all females.

Bees even have a special stomach, called a honey stomach,  which is used to store sweet fluid that the bees gather from flowers. Bees also have long hairs on their body and legs. These hairs capture pollen(花粉) as bees go from flower to flower. Some of the pollen is taken back to the hive. Some, however, is passed to the next flower. This is how many plants are fertilized. Pollen is the reproductive material of plants. Many important agricultural crops depend on bees for fertilization.

Inside their hives, bees store sweet liquid from flowers and pollen as well. They may even gather sweet liquid from some other kinds of insects. These kinds of sweet liquid are also stored in the hive.

Bees make honey through a process. They add liquid from their own mouths to sweet liquid into simple sugar. As the honey is stored, it dries. It becomes thicker and darker.

Although bees are often thought of as honey makers, they provide a surprising number of products. Also, their greatest economic value is in fertilizing crops-not in making honey.

小题1:The passage is mainly about             .

A.bees and their colony

B.the way for bees to pass pollen

C.bees and agriculture

D.the process for bees to make honey小题2:Honeybees are social insects because         .

A.they work in groups

B.there is queen bee in every colony

C.they live in a hive

D.each of them does the same job小题3:The most valuable thing honeybees do for people is in             .

A.making honey

B.fertilizing crops

C.making flowers grow better

D.producing pollen小题4:The word “fertilize” in the sentence “This is how many plants are fertilized” probably means “    ”.

A.to make plants strong and productive

B.to make soil rich for plants

C.to start the development of young flowers

D.to introduce pollen into plants

单项选择题