快捷英语 英语时文阅读理解 七年级
Thursday/Week 12
阅读短文,从短文后的选项中选出能填入空白处的最佳
选项。选项中有一项为多余选项。
文章音频
题型:任务型阅读
主题:植物生长
语篇类型:说明文
词数:203
难度:
建议用时:6分钟
tree starts from a seed. Once the seed takes
root, a stem grows out of the ground, and
it slowly becomes a tree. How long it takes to grow to

its full height depends on many things-most importantly the type of tree.
There are thousands of kinds of trees. 1
For example, white oaks need tens of years to reach their full height. 2 Gray birches reach full height in about 10 years but only live for 20 years.
Coast redwoods grow fast, and live long. 3 Fully grown, they can grow over 300 feet tall. They can live for over 1,000 years.
4 Each kind of tree gets used to its own home. A tree grows in certain kinds of soil and among certain animals and other plants. A tree may grow fast or slow, or tall or short, because those ways of growing help it continue to live in its home. Bad weather can also influence how it grows.
If trees get what they need, they usually reach full height before they're halfway through life. After that, their trunks, roots, and branches get wider. 5 That's amazing!
A. And each grows at its own speed.
B. But they can live for up to 600 years.
C. Young ones can grow over 3 feet a year.
D. So a tree is always growing and changing.
E. Why do trees become fully grown differently?
F. Some trees are taller than others even when young.

1. A 由上文“它需要多久才能长到其最大高度……世界上的树木有成千上万种”可推知，此处顺承表示：每一种都以自己的速度生长。
2. B 由上文“白橡树需要几十年才能长到它们的最大高度”及下文“灰桦树大约10年就能长到最高”可推知，此处与下文“但只能活20年”行文并列，对应表示：但它们的寿命可高达600年。
3. C 由下文“完全长大后，它们可以长到300多英尺高”可推知，此处对应表示：幼树一年可以长3英尺多。
4. E 由本段下文可知，每种树都会适应其特有的栖息地，特定的土壤、特定的共生动植物群，使它们生长得或快或慢，或高或矮，这些不同的生长方式能帮助它们得以延续下去，另外，恶劣的天气也会影响它们的生长方式。由此可推知，此处总结本段，对应表示：为什么树木会以不同的方式完成成长？
5. D 由上文“……它们通常会在生命过半前就达到最大高度。之后，它们的树干、树根和树枝会继续变粗”可推知，此处顺承表示：所以，树木总是在生长和变化。