Below is a text with blanks. Click on each blank, a list of choices will appear. Select the appropriate answer choice for each blank.
下面的文本有一些空格。点击每个空格会出现一组选项，请为每个空格选出最合适的答案。
The increasing darkness in the Northern Hemisphere this time of year "indicates to the plant that is coming on. So it starts recouping materials from the leaves before they drop off." Evergreens protect their needle-like foliage from freezing with coatings and natural "antifreezes." But broadleaf plants, like sugar maples, birches, and sumacs, have no such protections. As a result, they their leaves. But before they do, the plants first try to important nutrients such as nitrogen and phosphorus.
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