阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
Barack Obama has really gone wild. The US president has taken part in the survival television show Running Wild With Bear Grylls, which will air on NBC later this year. In the show, Obama goes on an adventure with host Bear Grylls, learning how to survive in the Alaskan wilderness.
Edward Michael “Bear” Grylls, 41, has become known around the world as one of the most famous outdoor adventurers. The Briton has appeared on a number of wilderness survival shows in which he has climbed, sailed, and eaten bugs or cow tongue.
Obama doesn’t have to eat bugs or cow tongue on his adventure with Grylls. But he does have to eat leftovers - a bloody salmon (三文鱼). It was partly enjoyed by a bear that left some meat behind.
Although he is far from the White House kitchen, Obama seems to enjoy the outdoors. “As president, I am in what’s called the bubble（保护膜）, and the Secret Service makes sure that I’m always out of danger ...  but  I sometimes want to get out,” he said in a video.
However, Obama’s appearance on the show isn’t just for fun. He took part to raise awareness of the effect global warming has had on the US’s largest state, Alaska.
On his adventure, Obama______.

A．has to eat something strange like bugs

B．enjoys cow tongue with Grylls

C．takes in some unusual food

D．never has any difficulty

It can be inferred from the passage that _____.

A．Obama has been tired of the life in the White House

B．US presidents have never been in danger because of the Secret Service

C．the food prepared in the White House is not as good as the food outdoors

D．The life outside the White House is sometimes attractive to the president

The purpose of Obama’s appearance on the show is _____.

A．to have some fun

B．to promote environmental protection

C．to enjoy the wilderness in Alaska

D．to get out of the White House for a change

Which of the following statements is true according to the passage?
A. Grylls is the most well known outdoor adventurer around the world.
B. The TV show with Obama’s appearance is now on air on NBC.
C. Obama learns how to survive with host Bear Grylls in African wilderness.
D. Grylls has special abilities to survive in the wild