搜题请搜索小程序“爱下问搜题”
问题 推断题

A、B、C、D、E为初中化学常见的物质，其中A、C为金属单质，E为非金属单质，下图是它们之间的相互转化关系．请回答（提示：CuO+H2SO4=CuSO4+H2O）

（1）反应①的基本反应类型是___________，

（2）C的化学式___________，E的化学式____________．

（3）X溶液与C反应的有关化学方程式_______________；____________________．

答案

（1）化合反应；

（2）Fe；H2；

（3）H2SO4+Fe=FeSO4+H2↑；CuSO4+Fe=FeSO4+Cu

单项选择题

长时间暴露在油类环境下可以引发（）。

A、咳嗽

B、感冒

C、皮炎

D、肺炎
查看答案
单项选择题

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.

7（）

A.incredible

B.spontaneous

C.inevitable

D.gradual
查看答案