搜题请搜索小程序“爱下问搜题”
问题 单项选择题

土壤肥力的四要素是（）。

A.水、肥、微生物、气

B.水、肥、气、热

C.肥、气、温、矿物质

D.养分、水、温度、湿度

答案

参考答案：B

选择题
给下列句子排序，最合理的一项是（   ）
①因为尘埃和水汽的结合可以变成云滴，成片的云滴就组成了厚厚的云层。
②温度太高，不但人类无法忍受，就是地球上的其他生物也会被“烤干”。
③有了尘埃，就使得近地面的低空多了一层保护膜。
④没有尘埃，地球表面将会热得不得了。
⑤云层具有“反光镜”的作用，可以将照在其上的一部分太阳辐射反射回宇宙空间，从而有效地削弱了太阳的威势。
A．④③②①⑤B．④⑤②③①C．④②③①⑤D．③④②①⑤
查看答案
填空题

Part 4


Questions 26-45


·Read the following passage and decide which answer best fits each space.
·Forquestions26-45, markoneletterA, B, C or D on the Answer Sheet.
Both (26) and zoology are parts of a more general field of science, biology. The two are studies of (27) things, which share certain characteristics, (28) they are plants or animals. Botany deals with plants, whose organisms that can (29) their own food by the use of sunlight. Zoology on (30) hand, deals with animals, those organisms that cannot manufacture their own food and are thus dependent (31) plants for their food.
(32) plants and animals share many abilities, the extent (33) which plants can exercise some of those abilities is (34) . For example, both plants and animals need food, water, and warmth for growth, (35) plants can move to (36) those needs only by the slow extraction of their leaves and roots, while animals can move relatively (37) distances in relatively little time. When an animal is hurt with needle, the animal will (38) the part of the body (39) . This ability to draw back (40) pain or irritation, called irritability, is found only to a very limited extent in plants.
If plants (41) the same (42) as animals, animals would have had a more difficult time finding food. If animals were as limited as plants, they might (43) a means of manufacturing their own food, as plants do now. The world would be a very different place (44) it is if the characteristics of plants and animals were (45)

A．But

B．Although

C．And

D．Furthermore
查看答案