An allergy is when the body’s immune system reacts to something that is usually harmless, such as pollen, dust or certain foods. Common signs include sneezing, itching and a rash. Which is given as an example of something that can cause an allergy?
We blink many times every minute. Blinking spreads tears across the eye, which keeps it moist and washes away dust. Why do we blink?
The school nurse sent a note home: “Please keep your child at home if they have a fever of 38 °C (100,4 °F) or higher. They may return when they have been free of fever for 24 hours without medicine.” When may a child return to school?
The river flooded after a week of heavy rain. Water covered the main road, so the town closed it and set up a detour through the hills. What caused the town to close the main road?
Coral reefs cover less than one percent of the ocean floor, yet they are home to about a quarter of all marine species. Warmer water can cause corals to lose the algae that feed them, a process called bleaching. What does the word “yet” signal in the first sentence?
Some animals hibernate in winter. Their heart rate and breathing slow down, and their body temperature drops. This saves energy at a time when food is hard to find. Why do some animals hibernate?
The author writes: “Some readers may find these figures alarming. Over the past decade, the number of nurses aged over 55 has doubled, while the number entering the profession has stayed flat.” What problem is the author most likely pointing to?
“The forest was eerily quiet. No birds sang, and the usual rustle of small animals had stopped. Then, far off, came a low rumble of thunder.” What mood does the author create?
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.