According to the author， why are cities frightening? 查看材料

未分类题Cooperative learning emphasizes on and collective responsibility.

单项选择题在爆破前，将爆破区内的液压支架、电缆等用挡帘挡牢(或给液压支架穿上裤套)，把采煤机开出爆破地点()以外，否则不许爆破。

未分类题根据题目要求完成下列任务。用中文作答。教师教授了“过去进行时”这一语法内容，根据这一语法内容进行了如下练习活动。Activity 1T: Hi， what were you doing at $ p.m. yesterday?S1: I was doing my homework.T: Good. Ask the student behind you the same question.S1: What were you doing at 8 p.m. yesterday?$2: I was watching TV. What were you doing at 8 p.m. yesterday?$3: I was cleaning my room. What were you doing at $ p.m. yesterday?Activity 2T: Now let‘s see who has the best memory. I was cooking at 6 o‘clock yesterday evening.What about you?S1: I was having dinner.T: Tell your partner like this: Ms. Zhang was cooking at 6 o‘clock yesterday evening. I washaving dinner.S1: Ms. Zhang was cooking at 6 o‘clock yesterday evening. I was having dinner.$2: Ms. Zhang was cooking at 6 o‘clock yesterday evening. S1 was having dinner. I wasdoing some shopping.$3: ...根据所设计的练习，回答下面三个问题。（1）该教师设计的两个活动属于什么类型的语法操练活动?请简要说明。（6分）（2）该设计中存在什么问题?（12分）（3）针对存在的问题提出合理的建议。（12分）

单项选择题()是一种无色、带有臭鸡蛋气味的剧毒性气体,相对密度1.19。

未分类题根据提供的信息和语言素材设计教学方案。用英文作答。设计任务：请阅读下面学生信息和素材，设计一个20分钟的阅读教学活动，教案没有固定格式。但要包括以下几点：teaching objectivesteaching contentskey and difficult pointsmajor steps and time allocationactivities and justifications教学时间：20分钟学生概况：某城镇普通初三年级第一学期学生，40人。多数学生已经达到《义务教育英语课程标准（2011年版）》三级水平。学生课堂参与积极性一般。语言素材：The Difficult Search for American Goods in the USIf you go to another country， what kinds of things would you buy? Would you buy a camera inJapan， some beautiful clothes in France， or a watch in Switzerland? No matter what you may buy，you might think those products were made in those countries. However. you could be wrong. KangJian is a 17-year-old student from Shanghai. Last year he went to visit his aunt and uncle in SanFrancisco. He found it interesting that so many products in the local shops were made in China. 'Iwanted to buy a toy car for my cousin， but even though most of the toys had American brands， theywere made in China.'Toys are not the only things made in China.'I wanted to buy a pair of basketball shoes，' heexplains.'But I had to visit five or six stores before finding a pair made in American!' Herealized that American can hardly avoid buying products made in China.'In fact，' he continues， 'there were so many things made in Chinafootballs， handbags， pet food， mobile phones. EvenAmerican flags are made in China! ' Kang Jian thinks it‘s great that China is so good at makingthese everyday things. However， he wishes that in the future China will also get better at makinghigh-technology products that people can buy in all parts of the world.