单选题What has happened in the past half-century?

单选题Which of the four major sectors contributing to carbon emissions accounts for the largest share?

单选题How much of the solar radiation can be converted into usable energy?

单选题Which of the following is NOT taught in schools?

单选题Which of the following is NOT true about many people who experience mental health problems?

单选题What would happen to some countries if tourism stopped?

单选题Compared with literature, communication stresses ______.

单选题Approximately how many of us will experience a mental health problem each year?

单选题According to the passage, what would happen to healthy cells within 48 hours of exposure to radio waves?

单选题Which of the following is NOT true about improved communication?

单选题Who were taken hostage in the reported kidnapping?

单选题Which of the following statements is NOT true according to the passage?

单选题The first state court to rule that gays had a constitutional right to wed was ______.

单选题Where do one-fourth of global carbon emissions largely come from?

单选题Elephants are afraid of bees because ______.

单选题When does the speaker say that another significant change in instrument design took place?

单选题Which of the following is true about coral reefs?

单选题Which of the following is NOT a possible cause of the housing crash?

单选题What do those who are concerned about body shape tend to do?

单选题What is an effective way of keeping the elephants away from farmland?