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【单选题】
If those 'mad moments'--when you can't remember what your friend has told you or where you left your keys--are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies require more maintenance with the passing years, so do brains, which scientists now know show signs of aging as early as the 20s and 30s. 'Brain aging starts at a very young age, younger than any of us had imagined and these processes continue gradually over the years,' said Dr. Gary Small, the director of the Center on Aging at the University of California, Los Angeles. 'Tin convinced that it is never too early to get started on a mental or brain-fitness program,' he added. In his book, The Memory Bible, the 51-year-old neuroscientist (神经学家) lists what he refers to as the 10 suggestions for keeping the brain young. They include training memory, building skills, reducing stress, mental exercises, brain food and a healthy lifestyle. 'Misplacing your keys a couple of times don't mean you should start labeling your cabinets. Memory loss is not an inevitable consequence of aging. Our brains can fight back,' he said. Small provides the weapons for a full-scale attack. Simple memory tests give an indication of what you are up against and tools such as 'look' and 'connect' are designed to make sure that important things such as names and dates are never forgotten. 'So if you wanted to learn names and faces, for example, you meet Mrs. Beatty and you notice a distinguishing facial feature, maybe a high eyebrow,' said Small. 'You associate the first thing that comes to your mind. I think of the actor Warren Beatty, so I create a mental picture of Warren Beatty kissing her brow.' Small admits it may sound a bit strange but he says it works. 'Mental exercises could be anything from doing crossword puzzles and writing with your left hand if you are right handed or learning a language. It could be anything that is fun that people enjoy doing,' he added. The 'mad moment' in the first paragraph refers to the time when we ______
A.
don't listen to our friends
B.
have lost our important things
C.
have some mental problems
D.
have a poor memory
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【单选题】可用于驱肠道吸虫药是()
A.
哌嗪
B.
伊维菌素
C.
硝氯酚
D.
盐霉素
【单选题】假设某种二倍体植物A的细胞质在遗传上不同于植物B。为了研究核-质关系,想获得一种植物,这种植株具有A的细胞质,而细胞核主要是B的基因组,应该采用
A.
A×B的后代连续自交
B.
A×B的后代连续与B回交
C.
A×B的后代连续与A回交
D.
B×A的后代连续与B回交
【单选题】假设某种二倍体植物 A 的细胞质在遗传上不同于植物 B。为了研究核-质关系,想获得一种植物,这种植株具有 A 的细胞质,而细胞核主要是 B 的基因组,应该怎样做?
A.
A×B 的后代连续自交
B.
A×B 的后代连续与 B 回交
C.
A×B 的后代连续与 A 回交
D.
B×A 的后代连续与 B 回交
【单选题】可用于驱肠道吸虫药是
A.
哌嗪
B.
伊维菌素
C.
硝氯酚
D.
盐霉素
E.
吡喹酮
【单选题】假设某种二倍体植物A的细胞质在遗传上不同于植物B。为了研究核-质互作关系,想获得一种遗传组成主要具有A细胞质和B细胞核的植株,应该 。
A.
B× A 的后代连续与 B 回交
B.
B× A 的后代连续与 A 回交
C.
A× B 的后代连续与 A 回交
D.
A× B 的后代连续与 B 回交
【单选题】可用于驱肠道吸虫药是( )。
A.
哌嗪
B.
伊维菌素
C.
硝氯酚
D.
吡喹酮
【单选题】假设某种二倍体植物A的细胞质在遗传上不同于植物B。为了研究核-质关系,想获得一种植株,这种植株具有A的细胞质,而细胞核却主要是B的基因组,应该 。
A.
B ×A的后代连续与B回交
B.
B×A的后代连续与A回交
C.
A ×B的后代连续与A回交
D.
A×B的后代连续与B回交
【单选题】营销公众不包括
A.
社团
B.
供应商
C.
媒介
D.
银行
【单选题】营销公众不包括
A.
媒介
B.
社团
C.
银行
D.
供应商
【单选题】营销公众不包括
A.
媒介
B.
供应商
C.
社团
D.
银行
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