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The biggest producing amount of sea rice on saline-alkaline soil has reached 620.95 kilograms per mu (0.07 hectare). It was far beyond experts’ expectations.

Sea rice was developed by China’s “father of hybrid rice” Yuan Longping’s team. The test was carried out in the field at the Sea-Rice Research and Development Center in Qingdao, east China’s Shandong Province, on Sept. 28.

The existing sea rice producing amount is only about 100 kilograms per mu, according to Yuan, which is not cost-effective for farmers. However, if the producing amount could be improved to 300 kilograms per mu, they would be much active in planting the rice. Yuan said he is very satisfied that the sea rice producing amount has exceeded 300 kilograms.

Rice is the first choice for improving saline-alkaline soil, of which there is 1.5 billion mu in China. About 300 million mu of that can be exploited. If one third of such land is used to plant the sea rice, the total producing amount could reach at least 30 billion kilograms, which could feed 80 million people in China, experts estimated.

Yuan also noted his and the institution’s hope to help other countries develop hybrid rice to contribute to world food security and peace.

1.The biggest hectare producing amount of sea rice is ______.

A 100 kilograms

B 300 kilograms

C 620.95 kilograms

D 8870.71 kilograms

解析：选D。数字计算题。根据第一段第一句The biggest producing amount of sea rice on saline-alkaline soil has reached 620.95 kilograms per mu (0.07 hectare).可知海水水稻的最高亩产量是620.95千克，一亩等于0.07公顷，因此海水水稻的公顷最高产量应该是8870.71千克，故选D。

2.The underlined word “exceeded” means ______ in Chinese.

A 超过

B 少于

C 等于

D 降低

解析：选A。词义猜测题。根据第一段第一句The biggest producing amount of sea rice on saline-alkaline soil has reached 620.95 kilograms per mu (0.07 hectare).可知海水水稻的亩产量已经达到了620.95千克，是超过300千克的，从前面的satisfy也可推知应该是超过，故选A。

3.______ saline-alkaline soil could be exploited to plant sea rice.

A 100 million mu

B 300 million mu

C 0.5 billion mu

D 1.5 billion mu

解析：选B。细节理解题。根据第四段第二句About 300 million mu of that can be exploited.可知可开发盐碱地有3亿亩，故选B。

4.Which of the following statements is TRUE?

A Yuan Longping did the experiment alone.

B The experiment can help grow better rice.

C The experiment can help increase the farmer’s income.

D Sea rice and hybrid rice is popular in other countries.

解析：选C。推理判断题。根据第三段可知目前的海水水稻的亩产量只有100公斤，对于农民来说成本较高不划算，如果亩产量可以达到300公斤，那么农民的积极性就会提高很多，主要就是因为成本降低了，收益增高了，而袁隆平的这一试验成果的亩产量还不止300公斤，对农民的收入提高更有推动力，故选C。

5.What can we infer from this passage?

A Sea rice needs many farmers.

B Hunger is still a global problem.

C Saline-alkaline soil produces more.

D Hybrid rice has been planted in many countries.

解析：选B。推理判断题。根据最后一段可知袁隆平希望能够在其他国家推广杂交水稻，并对世界粮食安全和和平作出贡献可推知杂交水稻目前仅用于中国，且世界应该还缺少粮食，饥饿仍然是一个世界性问题，故选B。