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Chất nào sau đây không phải là axit béo?
Kim loại nào sau đây tác dụng được với dung dịch H2SO4 loãng sinh ra khí H2?
Kim loại nào sau đây là kim loại kiềm thổ?
Thủy phân hoàn toàn cacbohiđrat X thu được dung dịch chứa hai loại monosaccarit khác nhau. Chất X có thể là
Để bảo vệ kim loại kiềm, người ta ngâm chúng chìm trong chất nào sau đây?.
Phát biểu nào sau đây không đúng?
A. Chất béo là trieste của axit béo với glixerol.
B. Chất béo nhẹ hơn nước, không tan trong nước.
C. Thủy phân chất béo trong môi trường axit gọi là phản ứng xà phòng hóa.
Cho từ từ đến dư kim loại X vào dung dịch FeCl3, sau khi phản ứng xảy ra hoàn toàn thu được dung dịch Y chứa hai muối. X là kim loại nào sau đây?
Kim loại nào sau đây có nhiệt độ nóng chảy cao nhất?
Chất nào sau đây có phản ứng màu biure?
A. Lipit.
B. Amin.
This is important to you because you are made up (46) _________ of water.
We left a message for his neighbor. We wanted him to know we'd come.
A. We left a message for his neighbor although we wanted him to know we'd come.
B. We left a message for his neighbor so that he would know we'd come.
C. We left a message for his neighbor in order for he to know we'd come.
I last saw her 2 years ago. She was working in New York then.
A. When I saw her 2 years ago, she worked in New York.
B. When I was last seeing her 2 years ago, she worked in New York.
C. When I was last seeing her 2 years ago, she was working in New York.
The windmill is still in good working order ___________ it has not been used since the 1950s.
After moving to cities, rural people become less _________ They start to get used to changes and new ideas.
The book is both lively and ____________ and represents a useful contribution to the literature in the subject.
Many families have added low-flow toilet and reduced garden watering, ____________ can reduce their water usage and save money.
He insisted that the baby __________ after his grandfather.
While Steve Jobs _____________ at high school, he met Steve Wozniak, who also loved electronics.
Unsafe ____________, one of the world's largest health and environmental problems, is responsible for 775,000 deaths each year.
___________ is a demographic and social process whereby people move from urban areas to rural areas.
________ awareness of environmental issues is key to keeping sustainable living at the forefront of people's minds, and an opportunity to educate people and spread the world to help protect nature.
His eldest brother, John, had a __________ career in the diplomatic service.
My family live in ____________ small house. There is no dining room so we have ____________ dinner in ____________ kitchen.
My daughters are like ____________________ these days - one loves baseball and the other loves ballet.
Many scientists blame global warming on industrial ________________ that trap infrared the heat in the atmosphere rather than letting it escape into space.
She was ____________ that her children should have the best possible education.
Although Valentine's Day has become a global industry with more than eighty million roses sold worldwide, the origins of the day are unclear and lost in the mists of time.
A. a long time ago and unforgettable
B. new enough for everyone to confirm
The toys have to be intact in their original boxes or they're not worth anything.
Traditional agricultural methods, which cause no damage to the environment, employed by the local people are highly sustainable.
I take my hat off to Ian - without him we'd have never finished this project on time.
At Linda's new house.
- Sandra: "What a lovely house you have."
- Linda: “____________”
A. No problem
B. I think so
After Patrice's party.
- Dick: "I enjoyed myself so much at your birthday party."
- Patrice: "______________”
A. Oh, I'm glad to hear that.
B. Oh, that’s kind of you
A. romantic B. compose C. progress D. overcome