英语健康海报图片简单漂亮-健康饮食海报英语手抄报 健康饮食手抄报

手抄报是一种可传阅、可观赏、也可张贴的报纸的另一种形式。下面我为大家带来英语手抄报,仅供参考,希望能够帮到大家。

小学英语教学反思范文

一、在中国,英语是外语,不是二语,不可习得。

在中国,很多人忽视了英语是一门外语,而不是第二语言,是英语学习效率低下的一个重要客观原因。

那么,第二语言与外语究竟有什么区别?它们是同一概念不同风格的用语,还是两个不同的概念?它对英语教学的效果会产生怎样的作用?

其实,我们知道,second 1anguage与first language相对,而foreign 1anguage和non-native language是与mother tongue和native 1anguage相对的。

first language和mother tongue和native 1anguage的共同特点是:(1)最早习得的语言,常常是在家庭环境中习;(2)熟练程度高。语言直觉强。

second language,foreign language和non-native language的共同特点是:(1)是一种双语现象;(2)在掌握的时间顺序上次于第一语言;(3)熟练程度一般不如第一语言;(4)习得方式一般是学校教育、家庭教育或自学。

首先,在语言环境方面,第二语言与外语有着根本的差别。第二语言学习者一般都有一个比较自然的语言环境。周围有众多的该语言的本族语使用者。由于种种原因,他们之间可能会有各种各样的联系。同时,由于该语言可能是“官方语言的一种(如英语、法语在加拿大,英语在印度等),新闻媒介、官方文件、广告等等为学习者提供了一个比较真实和自然的语言环境,而“外语”学习者一般来说则很难有这样的语言环境。

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一篇关于日本核电站辐射问题的报道:

Scientists lack complete answers on radiation risk

ShareretweetEmailPrint AP – Mother and daughter receive radiation exposure scanning in Fukushima, northern Japan Friday, March 18, … By The Associated Press The Associated Press – Fri Mar 18, 6:21 pm ET

Thyroid cancer for sure. Leukemia, probably. Too much radiation can raise the risk of developing cancer years down the road, scientists agree, and the young are most vulnerable. But just how much or how long an exposure is risky is not clear.

Those are among the unknowns scientists are contemplating as the crisis unfolds at Japan's stricken nuclear power plant.

In Japan, the Science Ministry said radiation levels about 19 miles northwest of the Fukushima Dai-ichi plant rose at one point Friday to 0.15 millisieverts per hour, about the amount absorbed in a chest X-ray. But levels have been fluctuating, and radiation at most sites that distance from the facility have been far below that.

Long term, it is clear radiation can induce cancer. But researchers can't just count cancer cases after a disaster and declare radiation responsible. Rates before and after must be compared to know if more cases occurred than would be expected.

That is why, 25 years after the Chernobyl accident, there is still controversy over its effects beyond the undisputed 6,000 cases of thyroid cancer. Of these cases, only 15 had proved fatal as of 2005, even though the Soviets were slow to treat victims of the catastrophe.

The records necessary to spot trends in other types of cancer as a result of Chernobyl are poor, said Dr. Fred Mettler, a University of New Mexico scientist who led a United Nations-sponsored team investigating Chernobyl's health effects.

"At the end of the day, the scientific data isn't there. My instinct is, there probably is an increase there, but it's too small to see," he said.

The U.S. Environmental Protection Agency says that no amount of radiation is absolutely safe above the 3 to 6 millisieverts a year that most of us get from normal living. In contrast, the Nuclear Regulatory Commission says that low doses — less than 100 millisieverts spread out over years — are not harmful. Researchers have not documented danger from such low levels, said Kelly Classic, a radiation physicist at the Mayo Clinic and a spokeswoman for the Health Physics Society, an organization of radiation safety specialists.

High doses — over 500 millisieverts — can raise the risk of leukemia, breast, bladder, col