设F(X)在(-∞，+∞)上是奇函数，在(0，+∞)上f'(x)<0，f"(x)>0，则在(-∞， 0)上必有( )。

A:f'<0，f"<0 B:f'<0，f">0 C:f'>0，f">0 D:f'>0，f"<0

某女性患者，26岁，发现左颈部结节一周。查体：左叶甲状腺下极可触及一约2cm×2.5cm结节，质地中等，活动，无压痛。血清甲状腺激素水平正常，TcO甲状腺静态显像示左叶甲状腺下极一"凉"结节。

术后病理提示左叶甲状腺下极乳头状癌，继之行甲状腺激素及I治疗。下列最适合应用F-FDGPET／CT进行随访的是

A:I全身显像阳性者 B:Tg水平升高，I全身显像阳性 C:Tg水平正常，I全身显像阴性 D:Tg水平升高，I全身显像阴性 E:以上均是

Across the Deserts

　　The SaharaDesertis the largest desert in the world. It stretches across Africa fromSenegaltoEgypt. TheSaharaDesertis an unfriendly environment. During the day it"s very hot, and at night it’s sometimes very cold. It is also difficult to find water in theSahara.

　　In 2006, Kevin Lin, Ray Zahab, and Charlie Engle decided to do something very difficult. They made the decision to run across the Sahara Desert 4,300 miles (6,920km). It seemed impossible to do, but they wanted to try. The three men liked to test themselves, and this would be a very big test.

　　On the morning of November 2, Kevin, Ray, and Charlie started their trip across theSahara. Every morning they began running at 5:00. At11 a.m. they stopped and rested until 5 p.m. Then they ran again until 9:30 in the evening. Each day they ran about 40 miles (64 km). Every day it was the same thing. They got up and ran. They listened to music on their iPods, and they ran and ran.

　　Kevin, Ray, and Charlie needed to eat a lot of food during their trip. Most people need about 2,000 calories of food each day. Kevin, Ray, and Charlie needed between 6,000 and 9,000 calories every day. That"s a lot of food! They also needed to drink a lot of water.

　　The three men had some problems on their trip, and many times they wanted to quit and go home. It was often very hot (140°F/60°C) during the day, and the heat made them sick. Their legs and feet hurt. Sometimes it was very windy, and they couldn"t see. One time they got lost. But they didn"t quit. After 111 days, Kevin, Ray; and Charlie successfully finished their trip across theSaharaDesert. They hugged each other and put their hands in the water of theRed Sea. Then they ran to a hotel to take a long shower.

　　词汇：

　　Stretch / strɛtʃ / v. 延伸，伸展

　　Calorie / "kælərɪ / n. 卡(路里)，小卡，大卡

　　Quit / kwɪt / v. 停止，放

　　注释：

In the middle of the day: the men usually stopped running.

A:Right B:Wrong C:mentioned

（2013）若f（-x）=-f（x）（-∞0，f″（x）<0，则f（x）在（0，+∞）内是：（）

A:f′（x）>0，f″（x）<0 B:f′（x）<0，f″（x）>0 C:f′（x）>0，f″（x）>0 D:f′（x）<0，f″（x）<0

若f(-x)=f(x)(-∞＜x＜+∞), 在(-∞，0)内f'(x)＞0，且f"(x)＜0，则在(0，+∞)内有______．

A:f'(x)＞0，f"(x)＜0 B:f'(x)＞0，f"(x)＞0 C:f'(x)＜0，f"(x)＜0 D:f'(x)＜0，f"(x)＞0

设f(x)=f(-x)，x∈(-∞，+∞)，且在(0，+∞)内，f'(x)＞0，f"(x)＞0，则f(x)在(-∞，0)内必有

A:f'(x)＞0，f'(x)＞0． B:f'(x)＞0，f"(x)＜0． C:f'(x)＜0，f"(x)＜0． D:f'(x)＜0，f"(x)＞0．

设函数f(x)在[0，1]上f"(x)＞0，则f'(0)，f'(1)，f(1)-f(0)或f(0)-f(1)的大小顺序是______．

A:f'(1)＞f'(0)＞f(1)-f(0) B:f'(1)＞f(1)-f(0)＞f'(0) C:f(1)-f(0)＞f'(1)＞f'(0) D:f'(1)＞f(0)-f(1)＞f'(0)

若f(x)=-f(-x)，在(0，+∞)内f’(x)＞0，f"(x)＞0，则f(x)在(-∞，0)内______．

A:f’(x)＜0，f(x)＜0 B:f’(x)＜0，f"(x)＞0 C:f’(x)＞0，f(x)＜0 D:f’(x)＞0，f"(x)＞0

设f(x)=f(-x)，x∈(-∞，+∞)，且在(0，+∞)内，f'(x)＞0，f"(x)＞0，则f(x)在(-∞，0)内必有

A:f'(x)＞0，f'(x)＞0． B:f'(x)＞0，f"(x)＜0． C:f'(x)＜0，f"(x)＜0． D:f'(x)＜0，f"(x)＞0．