工程图中的三视图是指正视图，侧视图和（）。 A.仰视图 B.俯视图 C.背视图 D.

木瓜茱萸汤2功效与作用

正硅酸钙对烧结矿质量有何影响？其生成条件是什么？

短文写作。

     假设你是李明，常常与英国网友Jim通信，以提高各自的外语水平。最近你收到他的电子邮件，

他对现在网络热词“淘课” 不太理解，还混淆了“淘课”与“逃课”。请根据下列要点，用英文

回一封电子邮件。

     要求：

     (1) 解释这两个词的区别；

     (2) 介绍“淘课”现在很受学生欢迎；

     (3) 谈谈“淘课”的作用。

   （背景知识：现在在网上“淘课”已成为一种时尚，美国很多知名高校都纷纷在网上开课，满足

全世界的求知欲。很多年轻白领不再像从前那样花钱参加各种培训班，而是到网上“淘课”，以此

进行充电，许多学生也在课余时间“淘课”，自己喜欢什么课程，就淘什么课程，也不花什么钱，

足不出户就可以打开眼界。）

     注意：

     (1) 词数为100左右；

     (2) 参考释义：逃课 be absent from some lectures;  淘课 search for some lectures；

     (3) 除以上两个词语外，邮件中不得使用其他汉字或拼音；

     (4) 电子邮件的开头和结尾已为你写好，不计入总词数。

Hi Jim,

     Nice to read your e-mail today. I notice you've begun to pay much attention to Chinese learning.

     _____________________________________________________________________________

________________________________________________________________________________

     Hope my explanations can help you and that you will make more progress in Chinese study.

Yours,

Li Ming

Research on animal intelligence always makes us wonder just how smart humans are. (1) the fruit-fly experiments described by Carl Zimmer in the Science Times. Fruit flies who were taught to be smarter than the average fruit fly (2) to live shorter lives. This suggests that (3) bulbs burn longer, that there is a(n) (4) in not being too bright.

Intelligence, it (5) , is a high-priced option. It takes more upkeep, burns more fuel and is slow (6) the starting line because it depends on learning — a(n) (7) process — instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to (8) .

Is there an adaptive value to (9) intelligence That’s the question behind this new research. Instead of casting a wistful glance (10) at all the species we’ve left in the dust I.Q.-wise, it implicitly asks what the real (11) of our own intelligence might be. This is (12) the mind of every animal we’ve ever met.

Research on animal intelligence also makes us wonder what experiments animals would (13) on humans if they had the chance. Every cat with an owner, (14) , is running a small-scale study in operant conditioning. We believe that (15) animals ran the labs, they would test us to (16) the limits of our patience, our faithfulness, our memory for locations. They would try to decide what intelligence in humans is really (17) , not merely how much of it there is. (18) , they would hope to study a(n) (19) question: Are humans actually aware of the world they live in (20) the results are inconclusive.

11（）

A.features

B.influences

C.results

D.costs