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3．不可否认的是，人们吃的越来越好，可身体却越来越差。

我的疑问：

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课内探究

质疑探究：

1. It is hard to think of a world without metals.

本句属于"It +is +形容词+不定式。其中It是___________主语，不定式是___________主语。

It is easier to say than __________说比做容易。

It is no good __________(play) computer games .

It is a shame that ____________________________(很遗憾他没有通过考试)

It is never too late to study . ____________________________________(英译汉)

2. When we use metals, it is important to know how they react with different substances, for example, water and oxygen.

I have travelled many cities__________ Bei jing,Shang hai, Guangzhou.

Some students, ___________, John, live in the city.

3. Here is a table with the metals that react most at the top, and the metals that react least at the bottom.

1)本句是here由引起的_________句子，其中，with the metals ... 为介词短语作____，修饰table，句中两个that 都引导定语从句，分别修饰两个metals .

2) 句子以there, here , out , in , up , down , away , now , then 等词开头，并且谓语动词为be, go ,come 等时，要用全部倒装，起强调作用。 例如：

Here is the key to your room .

There comes a ray of light from outside .

Now comes your turn .

Out went the children .

如果主语是人称代词时，则谓语不用倒装。例如：

Away they went ./Here you are . /Here it is.

4. The closer you are，the more you'll see.

你越近，看到的就越多。