单选题
In what way does pheromone work on the same species of plant or animal? A. It travels in the water. B. It travels through the air. C. It travels in the blood or plant sap.
【正确答案】
B
【答案解析】[解析] We've now had a way of working on insects to change their behavior with how to stop locusts swarming, and a possible way of changing crops to help them survive a drought. Now here's an ingenious piece of research that tries to do both at the same time. To control insect activity and help the crop grows through one treatment. It's all down to pheromones, the chemical signals that allow members of the same species of plant or animal to communicate. They're as powerful as hormones, which travel in the blood, but unlike hormones they travel through the air. And it's the 50th birthday of their discovery this year.
文中提到unlike the hormones，they travel through the air，因此可知，费洛蒙是通过空气传播的。
单选题
What is the problem the Australians face? A. The sheep taken by settlers have eaten too much of the grass. B. They have to pay a heavy price to keep the sheep population. C. The sheep have done a lot of damage to the local habitat.
【正确答案】
C
【答案解析】[解析] Today's Australians are well aware of the problems they face. Many of them come straight from the actions of the settlers in Darwin's time as they pushed towards the interior. They took millions of sheep with them. Sheep are crass unthinking creatures and they've done a lot to destroy the local habitat. It's not their mouths, but their hooves. Those sharp little appendages are new to Australia. The natives hop or ramble without their help. The grasses, in particular, have paid a heavy price.
根据sheep are...and they've done a lot to destroy the local habitat可知，绵羊对当地环境造成危害，与C项一致。
单选题
Why was the gunman concluded to be responsible for the murders of two incidents? A. Because he was asserted to use the same weapon in two incidents. B. Because some witnesses claimed that he committed these killings. C. Because the police confirmed that the vehicle he used had been found.
【正确答案】
A
【答案解析】[解析] The French President Nicolas Sarkozy says the gunman responsible for the murders of a teacher and three children at a school in Toulouse was the same one that killed three soldiers in similar incidents last week. In a nationwide television broadcast, Mr. Sarkozy said the same weapon was used each time. French police also believe the same vehicle was used. Chris Bockman, a journalist who's in Toulouse, says similarities between the attacks have been clear from the start.
单选题
What contributes to the hungry world besides poverty and a lack of food? A. The booming world population. B. The low productivity. C. The astonishing waste of food.
【正确答案】
C
【答案解析】[解析] The Worldwatch Institute said in 2011 far too many people were living with less than they needed. It says, for example, nearly one billion people were hungry and just as many were illiterate. Worldwatch Institute's Danielle Nierenberg said while a billion people went to bed hungry each night, it wasn't because of a lack of available food. The director of the Nourishing the Planet Project said besides poverty and a lack of access to food, much food is simply lost. Worldwatch estimates 1.3 billion tons of food is wasted each year.
文中提到besides poverty and a lack of access to food，much food is simply lost，下文中也有说到1.3 billion tons of food is wasted each year。所以答案选C，即过度的粮食浪费。
单选题
How many albums had Jason Aldean released according to the news? A. Four. B. Two C. One.
【正确答案】
A
【答案解析】[解析] The Number One Male Country Artist of the year was 34-year-old Georgia native Jason Aldean. He earned his big break with his fourth album, "My Kinda Party". The set has sold more than two million copies in the U. S. alone and ranks at Number Four on the all-genre Billboard 200 year-end chart. Two songs from the album reached Number One, including the Country-rap hit, "Dirt Road Anthem," which also tops Billboard's year-end Ringtones chart.
文中第二句提出he earned his big break with his fourth album。可以得出他已发行四张专辑的结论。