乳类是幼儿优质蛋白质来源，其中富含的（）还是粮谷蛋白质提高生_爱下问搜题

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问题单项选择题

乳类是幼儿优质蛋白质来源，其中富含的（）还是粮谷蛋白质提高生物价最好的补充。

A．蛋氨酸

B．精氨酸

C．赖氨酸

D．色氨酸

答案

参考答案：C

解析：

乳类的价值

乳类食物是幼儿优质蛋白、钙、维生素B₂、维生素A等营养素的重要来源。奶类钙含量高、吸收好，可促进幼儿骨骼的健康生长。同时奶类富含赖氨酸，是粮谷类蛋白的极好补充，每日适量饮用有益营养合理。

单项选择题 A1/A2型题

在我国，目前引起心房颤动最常见的病因是（）。

A.风湿性心脏病二尖瓣狭窄

B.情绪激动

C.急性酒精中毒

D.剧烈运动后

E.缩窄性心包炎

完形填空

When I stopped by to get a newspaper, a tall, sincere man came over to me asking for help with directions. With a printout of Google maps, he was looking for a     on the main street, but just couldn't find it. After checking out his written directions, I mapped it on my phone and showed him     where he needed to go.
He, in     , mentioned that he had tried going there, but there was no such street number and he just couldn't locate his hotel. I      it again for him. He thanked me with a big smile, shook my hand, and     . I got into my car and he got into his, and we     ways. As I drove to the next grocery store and went in, I sensed     wrong about the directions－so I Googled the address again and _    that he was looking for the right address but in a city half an hour away!
       it had been several minutes, and in the peak rush hour time, the chances of finding him a mile away－where he was surely still looking around－were     . But I thought I'd give it a（an）     and set off in that direction. I'd     noticed what his car looked like, and was just about to give up. I parked my car as I considered what else I could do－     , like magic, he drove right by and pulled over into a nearby parking spot, still     about where the hotel was.
When I     next to him, he couldn't believe it: "     did you find me?!" he asked. "I'm not sure, but I     that you are in the wrong city!" I showed him the right directions, and after more    and a handshake, we    . ' Likely that we'll never meet again, and that makes it much more _   .

B．parking spot

D．grocery store

D．acknowledged

B．Unbelievably

C．Consequently

D．Unfortunately

D．occasionally

C．pulled down

B．figured out

D．carried out

A．left together

B．returned home

C．waved goodbye

D．rushed away