题目内容：

    The worst outbreak of desert locusts (蝗虫) in decades is presently underway in the Horn of Africa. It is the biggest of its kind in 25 years for Ethiopia and Somalia — and the worst Kenya has seen for 70 years.

What we are seeing in East Africa today is unlike anything we’ve seen in a very long time. Its destructive potential is enormous, and it’s taking place in a region where farmers need every gram of food to feed themselves and their families. Most of the countries hardest hit are those where millions of people are already vulnerable (脆弱的) or in serious humanitarian need, as they endure the impact of violence, drought, and floods.

We have acted quickly to respond to this outbreak. The primary method of battling locusts is the aerial spraying of pesticides (杀虫剂). FAO’s “Locust Watch” service explains that “although giant nets, flamethrowers, lasers, and huge vacuums have been proposed in the past, these are not in use for locust control. People and birds often eat locusts but usually not enough to significantly reduce population levels over large areas.”

The UN’s Office for the Coordination of Humanitarian Affairs has released $10 million from its Central Emergency Relief Fund to fund a huge scale-up in aerial operations to manage the outbreak.

But the window to contain this crisis is closing fast. We only have until the beginning of March to bring this infestation under control as that is when the rain and planting season begins. If left unchecked — and with expected additional rains — locust numbers in East Africa could increase 500 times by June.

We must act now to avoid a full-blown catastrophe. And we will. At the same time, we need to pay attention to a bigger picture. This is not the first time the Greater Horn of Africa has seen locust outbreak approach this scale, but the current situation is the worst in decades. This is linked to climate change. Warmer seas mean more tropical storms, generating the perfect breeding conditions for locusts.

1.What is implied in paragraph 2?

A.People in East Africa are suffering drought.

B.People in East Africa are going through floods.

C.The locust outbreak will cause crop failure.

D.The locust outbreak is worsening locals’ life.

2.What can we learn from the last paragraph?

A.We need a bigger picture to study the disaster.

B.It is the second outbreak of locusts in East Africa.

C.It is the largest outbreak of locusts ever in history.

D.The outbreak of locusts is fueled by global warming.

3.What is the purpose of the text?

A.To analyse and compare. B.To inform and call for.

C.To argue and discuss. D.To introduce and assess.

4.Where does the text probably come from?

A.A guidebook. B.A health magazine.

C.A news report. D.A chemistry paper.