题干

人剧烈运动后,释放大量乳酸,但pH变化不大,主要原因是( )

A:乳酸在血浆中很快被分解生成CO2和H2O,并排出CO2

B:NaHCO3与乳酸反应,调节pH

C:H2CO3抑制乳酸的酸性,并通过呼吸系统排出CO2

D:乳酸酸性弱,不易引起酸中毒

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答案(点此获取答案解析)

B

同类题3

阅读下面短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。

A

Safety and Security Procedures

   Your safety and the security of your personal property(财产) are of the primary concern to those of us who welcome you as our guest. We urge you to take advantage of the following suggestions.

 YOUR VEHICLE

   Lock your vehicle and do not leave money or valuable items inside. We are not responsible for their loss.

TRAVELING

   Be good at noticing things around you when sightseeing or traveling. Stay in heavily traveled areas. Don't display large amounts of cash.

GUEST ROOM SECURITY

   For additional security, use the deadbolt (插锁) provided on your door and make sure the windows are locked. As an additional precautious measure, please secure the secondary locks provided. Do not admit anyone to your room without first making identification. A one-way viewer is provided in your door to assist with identification. If there is any doubt about the person's identity, please contact the Front Desk.

SAFETY BOXES

   Do not leave money or valuables in your room or vehicle. We provide free safety boxes for you. We are not responsible for items left in room valued over $200.

KEYS

   Safeguard your key. Please do not leave it in the door. Do not give your key to others or leave it unattended. Please leave your key at the Front Desk when you check out.

FIRE

   Please familiarize yourself with the nearest fire exits. Report fire or smoke to the hotel operator. In the unlikely event of a fire, please move quickly and calmly to the nearest safe exit and leave the building. Avoid the use of the elevator.

REPORTING

   Please report any suspicious activity, or safety concerns to management.

同类题4

阅读下面短文,从短文后各题所给的A、B、C和D四个选项中,选出可以填入空白处的最佳选项。

    In December 2016, Jordan Kahana was driving along a highway in Arizona when he 1 two small dogs on the side of the road. The puppies were eight weeks old. Kahana was on his 2 to Colorado to celebrate the beginning of the New Year with friends, but he stopped and rushed the 3 abandoned(被抛弃的)dogs to the animal hospital. After that, Kahana decided to 4 them.

    Kahana 5 his job as a digital director in 2017 to travel more. 6 he rescued the pups he was planning on 7 full time. He had bought a one-way ticket to Bali in November, to leave that upcoming March. After rescuing the pups, however, his plans took a bit of a 8. But still, the 9 was to travel. So 10 flying for international adventures, he decided road trips would be their thing!

    11 then, the 30-year-old man has traveled about 32,000 miles with the two 12pups, who he named Sedona and Zeus. So far, the three have been to 35 states together and hiked through 13 national parks. They've even visited Canada. Kahana posts his travels on his 14 Instagram account viewed by hundreds of thousands.

    When asked how he 15 Sedona's and Zeus' names, Kahana said that he first found the dogs when he was 16 from Sedona, Arizona to Page, Arizona.He thought Sedona was a 17 name for the female puppy and Zeus, which sounds a good name for a 18 dog, was taken from Greek Mythology.

    “I was 19 forced to become a morning person,” Kahana said. “The pups, without 20, wake me up around 6:30 in the morning to go out for a walk.”