题目内容：

If you believe in thermometers（温度计）,you should believe in global warming. And if you believe in eating fries with your burger, you should worry more about carbon emissions.

It won't happen overnight, but as the planet's climate changes, the growth cycles of main crops will all be heavily affected .Here are three of the crops that might not beat the heat.

The potato actually needs a great deal of beauty rest to develop properly. “They need a cool nighttime temperature in order to start growing the tuber, the part that we eat,” Nelson says.

Temperature and altitude are two primary concerns in coffee growth, and farmers are stuck between a rock and a hard place. “We know that coffee grows in a certain temperature range,” Nelson says. “They've been moving up the mountains, but at some paint you run out of mountains to move up.” Higher-grade strains of Arabica coffee in Central American regions are at particular risk due to the need for lower growing temperature, especially since diseases and pests are also becoming more of a factor as temperatures rise.

Even if you're looking at the direct effects of temperature alone, rice is in trouble. “As nighttime temperatures go up ,the rice is going to have a problem flowering and won't make as many seeds,” Nelson says. In addition to this direct heat consequence, rising sea levels will flood many rice fields and destroy water salinity levels, while droughts will lower production, raise prices, and further shame westerners who are too clumsy with chopsticks to be able to clear their plates once a new grain is adopted.

1.What is the closest meaning to the underlined word “emissions” in Paragraph 1?

A. Mixture.    B. Pollution.

C. Going down.    D. Letting off.

2.What does the potatoes' development need according to Nelson?

A. Enough water and salt.    B. Cool temperature at night.

C. Much sunshine and fresh air.    D. Sudden rise of the temperature.

3.The rice is difficult to flower, probably because______.

A. sea levels go up suddenly    B. the temperature rises at night

C. many seeds can't be produced    D. both temperature and altitude rise

4.What is the best title for the text?

A. How Does Global Warming Affect Westerners

B. How Does The Cool Temperature Affect Ride

C. What Is The Real Reason For Crops' Growth

D. Three Crops That Won't Survive Minor Climate Changes