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问题 多项选择题

教案编制需要把握如下要点：研究课程标准；研究教科书；（）；选择教学方法；教学准备（教具、学具或其他）；设计教学过程；设计板书（或制作PPT演示文稿）。

A.了解教学情景

B.确定教学目标

C.分析难点、重点

D.掌握授课时间

答案

参考答案：A, B

单项选择题 案例分析题

若动画片《喜羊羊与灰太狼》有一集想设计喜羊羊“遁地”前往地球另外一侧去看看。他从家中钻入地下，始终保持直线前进并穿越地心。据此回答题。

在她穿越地心前，依次穿越的是：（）

A．地壳—莫霍界面—地幔—古登堡界面—地核

B．地壳—古登堡界面—地幔—莫霍界面—地核

C．地幔—莫霍界面—地核—古登堡界面—地壳

D．地壳—地幔—地核—莫霍界面—古登堡界面
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单项选择题

It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too.
The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte- literally, "fish killer. " It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding.
Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them.
Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation.
To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack.

All the following names are used to describe the organism EXCEPT ______.

A. dinoflagellate


B. Pfiesteria piscimorte
C. killer algae


D. a science fiction
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