Every year, butterfly(蝴蝶) lovers in California go out in November to count monarch butterflies. They 【小题1】(get) a worrying result from their fall monarch count in 2018—【小题2】 number of monarchs had dropped by 86% since 2017.
The orange and black monarch butterflies are famous 【小题3】 their long migrations(迁徒)—they fly thousands of miles every year. In the spring and summer they fly north; in the fall they fly south again.
Monarchs, like most butterflies, are 【小题4】(terrible) important for plants. They help create more plants by spreading pollen(花粉) between plants. In turn, monarchs depend on plants for food. And they depend completely on a plant called milkweed 【小题5】(lay) their eggs.
But monarchs have been facing growing problems for years. As more and more wild land has been turned into large farms, the monarchs have had trouble 【小题6】(find) enough milkweed. Many farms also use chemicals 【小题7】 will kill insects in order to protect their plants. These chemicals also affect monarchs. Besides, pollution has made milkweed less 【小题8】(health) for the monarchs than it used to be.
Scientists say monarchs will be in danger of dying out in the next 20 years if nothing 【小题9】(do) to save them.
【小题10】(thing) that people can do to help include planting milkweed, controlling the use of chemicals, protecting wild areas, and planting trees.
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