题目内容：

Researchers say public mistrust of vaccines（疫苗）is causing diseases like measles（麻疹）and yellow fever to spread. The scientists said the lower levels of trust can lead to people refusing vaccines. This, in turn, can cause diseases to spread quickly, they warmed.

But the researchers said they also found a high level of support worldwide for vaccinating children against disease.

The researchers questioned 66,000 people in 67 countries to discover their ideas on whether vaccines are important, safe and effective. The survey showed people in Southeast Asia had the highest level of trust in vaccines. Africa showed the second highest level of confidence. Europeans showed the lowest level of confidence in vaccines. In France, 41 percent of the population questioned the safety of vaccines.

Heidi Larson is with the London School of Hygiene and Tropical Medicine. She says recent media reports of problems involving vaccines have hurt public confidence in France. Larson noted that many Europeans worried about reports of possible links between hepatitis B vaccines（乙型肝炎疫苗）and the disease multiple sclerosis（多发性硬化症）. But she said scientists found no linkage between the two. Mistrust in France was also driven by public reaction to the H1N1 influenza（甲型H1N1流感）outbreak fears in 2009. The French government spent $1.4 billion on 94 million doses of the vaccine. The majority were sold or destroyed.

The findings come as a major yellow fever vaccination program has been launched in the Democratic Republic of Congo and Angola. The disease has already killed hundreds of people in the area. The World Health Organization aims to vaccinate over 15 million people in both countries. “If everyone agrees to be vaccinated, we can remove yellow fever from our country,” said Mosala Mireille, one of the doctors directing the program.

1.The author develops the Paragraph 1 mainly ________.

A. by telling experiences    B. by giving instructions

C. by offering descriptions    D. by analyzing cause and effect

2.The underlined words “The disease” in the last paragraph probably refer to ________.

A. measles    B. yellow fever

C. H1N1 influenza    D. multiple sclerosis

3.Mistrust of vaccines in France was driven by the following reasons except ________.

A. media reports of problems linked to vaccines

B. public reaction to the H1N1 influenza outbreak fears in 2009

C. connections between hepatitis B vaccines and the disease multiple sclerosis

D. most of the doses of the vaccine were sold or disposed of by the French government

4.Mosala Mireille’s attitude towards the yellow fever vaccination program is ________.

A. Expectant    B. Skeptical

C. Critical    D. Cautious