皮皮学，免费搜题
登录
搜题
【单选题】
谈话时,下列做法不正确的是()。A.
等对方讲完话自己在发言
B.
随意插话
C.
不要跷二郎腿
D.
不要随意打断别人讲话
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】The Power of Positive Thinking Human emotion is one of those factors that cannot he definedexactly. The reason is that it is quite uncertain. We cannot change thefeelings that are roused when we exper...
【多选题】How do point mutations in regulatory DNA sequences change our ability to digest lactose in milk?
A.
Our earliest ancestors were lactose intolerant, because the enzyme that breaks down lactose—called lactase—was made only during infancy. Adults, who were no longer exposed to breast milk, did not need the enzyme.
B.
When humans began to get milk from domesticated cattle some 10,000 years ago, variant genes—the product of random mutation—enabled those who carried the variation to continue to express lactase as adults, and thus take advantage of nutrition provided by cow’s milk.
C.
We now know that people who retain the ability to digest milk as adults contain a point mutation in the regulatory DNA sequence of the lactase gene, allowing it to be efficiently transcribed throughout life. In a sense, these milk-drinking adults are “mutants” with respect to their ancestors
D.
It is remarkable how quickly this adaptation spread through the human population, especially in societies that depended heavily on milk for nutrition. These evolutionary changes in the regulatory DNA sequence of the lactase gene occurred relatively recently (10,000 years ago), well after humans became a distinct species.
【简答题】水生花卉指什么？有哪些类型？
【简答题】绝妙的艺术珍品——鸟卵 我们都见过鸡蛋和鸭蛋。鸡蛋的色泽有黄红色的，也有白色的，而鸭蛋却是青白色的，它们是最普通的鸟卵。世界上近九千种鸟类，它们的卵大小不一，颜色各异，形状不同，千变万化。绿的形如翡翠，蓝的恰似宝石，白的好象玉石，红的如同玛瑙。卵壳表面的斑驳点块，就跟镶嵌在上面的五颜六色的珍珠一样，闪闪发光，耀眼夺目。它是大自然赐给人类的绝妙的艺术珍品。 鸿雁的卵壳黄中透红；白鹭的卵壳为翠绿色，短...
【简答题】This virus, called 2019-nCoV, is new and we are still learning about it. From what we know now, it can make some people (Q1) ____________________ with a slight (Q2) ________________. Other people get ...
【简答题】水生花卉对生境的需求有哪些特点？
【简答题】Answer the following questions and organize them into a paragraph. Cues are given at the end of each question. Combine the answers, using such words as which , but , since , because , as , and , for ,...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
