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引起巨幼红细胞贫血是由于缺乏
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【单选题】Read the section "Dangerous Chemicals Were Dumped In The River." Select the paragraph that explains what type of pollutants got into the Bronx River.
A.
A turtle's health can say a lot about the river's health. That's because turtles live a long time. Plus, they generally stay put. The turtle constantly takes in its environment. This gives pollutants in a river plenty of time to build up in the turtles' bodies, Sykes explains.
B.
The Bronx River was once clean. Native Americans used to fish in it. The river's health changed by the 1850s. That's when it was pumped full of garbage, sewage and other waste. It became full of dangerous chemicals called PCBs, lead and mercury.
C.
In the 1960s and 1970s the government cracked down on these chemicals. They could no longer be used as much. It helped make the Bronx and other rivers a little bit cleaner.
D.
How clean? When Sykes got the turtles' tests back from the lab, he didn't see any signs of mercury.
【简答题】They rely on a wind turbine to (4) electricity.
【简答题】Most people __________1_____________(认为快餐对人们的健康不利),but I don't think so.Going to KFC or McDonald's ________2__________(吃快餐) is a good way ____3_____(节省时间)。You know, dumpling s takes a lot of tim...
【简答题】阅读理解。 A man is going to the house of a rich man. He sees a box of good apples by the road. He says, 'I don't want them, because the rich man will give me a lot of good food.' Then he takes the apples ...
【简答题】感受器电位不具备的特点是
【简答题】一、 根据句意及汉语提示写出单词 1. Andy likes her job and she takes care of ________ (生病的) people in the hospital, 2. Mr. Wang is kind and he is always________ (准备好的) to help others. 3. We are all afraid of our ____...
【单选题】感受器电位不具备的特点是
A.
类似局部电位的电变化
B.
"全或无"形式
C.
产生在刺激转变成为传入神经纤维上的动作电位之前
D.
是一种过渡性慢电位,在一定范围内其大小与刺激强度成正比
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