英语复合句中主谓一致性是一个复杂而重要的语法原则
在英语复合句中，主谓一致性是一个重要的语法原则，指的是主语和谓语在数（单数或复数）和人称（第一人称、第二人称或第三人称）上必须保持一致。这有助于确保句子的语法正确和意思清晰。
在复合句中，主谓一致性的规则通常适用于主句，而不是从句。这意味着，即使从句中的主语是复数，只要主句的主语是单数，那么主句的谓语也应该使用单数形式。例如：
"He said that they were coming."（他说他们将要来。）
在这个例子中，"he"是主句的主语，是单数，所以谓语"said"也是单数形式。尽管从句中的主语"they"是复数，但这并不影响主句的谓语形式。
然而，也存在一些特殊情况，需要注意：
1. 当从句作为整体作为主句的主语时，主谓一致性应根据从句的内容来确定。例如：
"That they are coming is good news."（他们要来是好消息。）

在这个例子中，"that they are coming"是一个主语从句，虽然从句的主语"they"是复数，但由于整个从句作为主句的主语被视为一个整体，所以主句的谓语"is"使用了单数形式。

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2. 当从句的谓语是复数形式时，即使主句的主语是单数，主句的谓语也可以是复数形式。例如：
"Each of them says that they are coming."（他们每个人都说他们将要来。）
在这个例子中，"each of them"作为主句的主语是单数，但谓语"says"却使用了复数形式"say"，这是因为在这种情况下，主句的谓语应该与从句的谓语保持一致。
总之，在英语复合句中，主谓一致性是一个复杂而重要的语法原则。为了正确掌握这一原则，需要理解复合句的结构和从句的作用，并根据具体情况灵活运用主谓一致性的规则。

Even though vaccination (接种疫苗) is a powerful defense against disease, some voices are against it. In a recent letter, the American Medical Association (AMA) urged big social media including Amazon, Facebook and Google to take action to defend medical science on their platforms.
It said that vaccine -preventable diseases that do harm to the public health like measles (麻疹) are on the rise. Measles cases worldwide jumped more than 30% in 2017 compared to 2016, with the largest increases seen among nations in the Americas, Europe and the Eastern Mediterranean. Vaccine-preventable diseases are increasing largely because many people are unwilling to get vaccinated. And some of these people even encourage others to refuse vaccination. So this year, the World Health Organization (WHO) declared the anti-vaccination movement a top 10-health threat.
“Vaccination is one of the most cost-effective ways of avoiding disease—it currently prevents 2-3 million deaths a year, and a further 1.5 million could be avoided if global coverage of vaccinations improved,” WHO said.
A research article published in 1998 in a medical journal suggested a link between a vaccine and the development of autism (孤独症) in young children. Although the research has been suspected and many other studies have proved that vaccinations do not cause autism, the article is still impressing people strongly today. Another reason for the growth in the anti-vaccination movement is widespread misinformation on social media, which can turn people against vaccination.” If a concerned parent consistently sees information in their Newsfeed that casts doubt on the safety of vaccines, it could cause them to disregard the advice of their children’s physicians and public health experts and refuse to follow the recommended vaccination schedule. So access to true information about vaccine safety is badly needed.
8．What does the AMA require social media to do on their platforms?
A．Stop vaccine misinformation.
B．Unite to develop new vaccines.
C．Give up the anti- vaccination movement.
D．Introduce Vaccine-preventable diseases.
9．Why does the author mention the measles cases?
A．To declare measles can be prevented,
B．To show the result of anti-vaccination.
C．To prove some countries refuse vaccination.
D．To explain the reason for avoiding vaccination.
10．Which of the following play an important role in the anti- vaccination movement?
A．The costs of vaccination. B．The social media platforms.
C．The concerns of vaccine safety. D．The articles about autism.
11．Where is this text most likely from?
A．A novel. B．A brochure.
C．A diary. D．A magazine.

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