线索词为教授所说:Pollen and starch grains,for example,have been used in archaeological studies,as have what are called “phytoliths.”本篇讲座主要讲解phytoliths(植物岩)在科学研究中的运用。A选项错误,因为花粉与植物岩这两种分析法的对比仅为细节内容。本篇讲座并未全文对比。B选项属原文未提及。文中...
But the one reason for tree loss that humans can control is sensible development. F. Nowak says there is a downside to trees too, such as pollen allergy (花粉过敏) or large tailing branches in storms, and people don’t like sweeping leaves. But, he says, there are ways cities and ...
Your friend is allergic to pollen. What should you remind him? A. Play in the flower garden every day B. Wear a mask when going out C. Smell the flowers closely D. Touch the flowers often 相关知识点: 试题来源: 解析 B。解析:对花粉过敏出去的时候应该戴口罩,A选项每天在花园里玩、C选项...
1. For skin and mucous membrane allergies: suitable for allergic rhinitis, vasomotor rhinitis, allergic conjunctivitis, urticaria, angioedema, allergic reactions to blood or plasma products, skin scratches, pollen allergies, insect allergy reactions, food or drug allergies, contact dermatitis, and can ...
Step 1 Introduction : Pollen is a powdery substance consisting of microscopic grains produced by the male re...View the full answer Step 2 Unlock Step 3 Unlock Answer UnlockPrevious question Next questionNot the question you’re looking for? Post a...
What is the purpose of mimicry? What is the purpose of aseptic technique? What is the purpose of the vas deferens? What is distention of the bladder? What is behind the bladder? What is respiratory arrest? What is the transfer of pollen called?
12.What is the main purpose of this passage? A.To explain the concept of symbiosis by expanded descriptions of its principal types B.To make a comparison between human relationships and symbiotic interactions in the natural world C.To demonstrate the unforeseen benefits of natural processes that ...
Why do all flowers produce pollen, but not all produce nectar? Why is pruning important for the development of plants? How do flowers improve the efficiency of plant reproduction? What factors influence the development of a plant? What is the purpose of Beltian bodies on the ant-acacia ...
Background: We used receiver operating characteristic (ROC) curves to determine optimal cutoff values and to evaluate the ability of ragweed, mixed grasses, mixed trees. and house-dust antigens to predict symptoms of hay fever and asthma. Methods: Between 1984 and 1993, 13...
Corn silk is simply one of the female parts of the corn plant. The male part of corn is the tassel which sprouts from the top of the plant. The pollen comes from the tassel. Corn silks are actually tiny tubes where grains of pollen will land. The pollen will travel down the silk tub...