Clara Barton was a nurse during the American Civil War. She cared for wounded soldiers on the battlefield. Later, in 1881, she founded the American Red Cross. What did Clara Barton found?
Plants make their own food through photosynthesis. They use sunlight, water and carbon dioxide from the air to make sugar, and they give off oxygen. What gas do plants give off during photosynthesis?
A doctor uses a stethoscope to listen to sounds inside the body, such as the heartbeat and breathing. What is a stethoscope used for?
“After weeks of practice, Mei could finally play the whole piece without looking at the music.” What does “finally” suggest?
“The patient’s blood pressure was stable throughout the night, with every reading close to the one before.” What does “stable” mean here?
“The word ‘hydrate’ comes from the Greek word ‘hydor’, meaning water. To hydrate is to supply with water.” What does “dehydrated” most likely mean?
“When Aunt Rose saw the broken vase, she said, ‘Well, I never liked that vase anyway,’ and gave her nervous nephew a wink.” Why did Aunt Rose most likely say this?
“The surgeon, who had performed the operation hundreds of times, still reviewed every step the night before.” What does this detail reveal about the surgeon?
完整分步解答：请在 examproblems.com 上练习本主题。