问题
单项选择题 B型题
皮下的7-脱氢胆固醇是人体合成()的前体物质
A.蛋白质
B.组氨酸
C.维生素D
D.钙
E.烟酸
答案
参考答案:C
皮下的7-脱氢胆固醇是人体合成()的前体物质
A.蛋白质
B.组氨酸
C.维生素D
D.钙
E.烟酸
参考答案:C
补全短文。根据短文内容,从短文后的A~F 选项中选出适当的选项补全短文,并将选项的编号依次填入下面的表格内,其中有一项是多余的。(共5小题,每小题1分;计5分) How do you remember the way to your house? Where do dreams come from? _____小题1:_____ A British scientist showed that “sleep can improve one’s memory.” _____小题2:_________ In fact, your brain is working day and night. If you learn words before bed, a certain part of the brain may help you to remember the words while you sleep. ______小题3:________ It might make a person more talented. There was more interesting things about the brain. ______小题4:_________ Just two bananas can give the brain enough energy to work for a whole day. According to some scientists, yawning(打哈欠) keeps our brains “cool”, which makes us think quicker. _______小题5:____________ ① Eat healthy foods. ② Get a lot of playtime or exercise. ③Don’t drink or smoke. ④Use your brain a lot.
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