root.
Also, to reduce the gas’s effect on your eyes , cut it next to a window or near a fan so the gas is blown away from your face. And take care to use a sharp knife; this will make it easier to move through the vegetable, causing fewer cells to be broken and less gas to be released as a result. 28. Refrigerating the onion before cutting can . A. change its taste B. make it easier to cut up C. avoid generation of the gas D. help the gases mix more quickly
29. From the fourth paragraph, what happens when the onion is cut up? A. Some acid mineral is lost. B. The tear mixture is created. C. The sulfur inside it pours out. D. A chemical reaction produces a gas.
30. What does the underlined word”this”in paragraph 5 refer to? A. Producing more tears. B. Leaving the root uncut first. C. Promoting concentration. D. Making the onion more tasty.
31. The main purpose of the text is to . A. advise and explain B. examine and analyze C. argue and discuss D. present and compare
D
Do you have a younger brother? Does he always get in trouble? w ll, there might be some science behind that.
According to a report from the Massachusetts Institute of Technology, second-born boys are more likely than first-borns to behave badly, which could be why you from time to time consider your younger brothers or sisters sprites.
Researchers, who explored data from tens of thousands of sibling(兄弟姐妹) pairs from Denmark and Florida,
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