Thank you, Mary. It's really_____ useful

You have to keep on learning if you want to keep ______ with the development of modern

science and technology.     [ ]

A. peace    

B. touch  

C. pace  

D. connect

由六百万、九十万、三千和五个一组成的数是______．

Agricultural experts met in Ethiopia last week to discuss ways to help sub-Saharan Africa become a major producer of wheat. The area traditionally produced little wheat, while North Africa was the grain basket.

Wheat production fell sharply in sub-Saharan countries during the 1980s. In the 1960s, attempts were made to grow wheat in sub-Saharan Africa, including South Africa and Zimbabwe. But those countries found it was less costly to import wheat from Europe and the United States. Another problem is that Africa's wheat farms were often far from population centers. There also were transportation issues. And some lowlands were not a good place to grow wheat.

Hans Joachim Braun_,one of the experts, says now is a good time to increase wheat production. In the last four years we have seen three major price hikes, where the wheat price and other staple process (主食加工）exploded. And that puts a big, big bill on countries which are depending on wheat imports, and Africa is the biggest wheat importer.

He also says demand for wheat in sub-Saharan Africa is growing faster than for any other crop. With higher income people would like to have more diversified(多样化）food. But that is possible not the most important one. The most important one is that there is a tremendous migration(移民）of in particular male labor to the cities. And wheat products are convenient food because you can easily buy it. It's easy to process and you also can store it for a few days, which is different from some of the maize and rice products.

There are three possible challenges for growing more wheat in Africa： climate change, disease and pests, like insects. Mr. Braun says rising temperatures should not have a major effect on wheat. In fact, he says, it could help wheat grow in areas with high rainfall totals. As for fighting disease and pests, experts suggest growing more resistant crops. In addition, railroads and roads would have to be improved so large amounts of wheat could be moved to large markets.

小题1:What does the word "hikes" in Paragraph 3 probably refer to?

A．big changes

B．large increases

C．long trips

D．big bills小题2:Wheat price exploding indicates_____.

A．sub-Saharan countries need to increase wheat production badly

B．sub-Saharan countries have to issue more money

C．sub-Saharan countries should grow more Corn

D．importing much wheat is urgent小题3:Why is there a higher demand for wheat in sub-Saharan Africa？

A．Because the number ofhungry people there is increasing.

B．Because higher income people have the diversified need of food.

C．Because male labor are crowding into the cities.

D．Because the wheat price is lower.小题4:According to Mr. Braun the main challenges for growing more wheat in Africa are_____.

A．climate change and disease

B．resistant crops and climate change

C．rising temperatures and disease and pests

D．disease and pests and inconvenient transportation

请看下面耳的基本结构图回答：

（1）具有收集声波功能的是[  ]      [   ]      

（2）有些人晕车，与耳的[    ]        有关。

（3）听觉感受器位于[  ]         中，听觉的形成在           。

（4）感冒以后，病菌可以从[ ]       进入中耳，引起人的中耳炎。

（5）同学打闹请勿用手掌煽耳光，以防压缩空气冲击[  ]           导致破裂。

（6）人除了能用眼感受光的刺激，用耳感受声音的刺激，还能用        感受气味的刺激，用        感受味道的刺激，用          感受冷、热、触、痛、压的刺激。

（7）当飞机降落时，乘务员要求旅客咀嚼食物，其目的是【 】    张开，使【 】    内外的气压保持平衡，防止胀痛。

（8）参照图分析判断：“将鼓膜的振动传到内耳的、将外界声波刺激转变为神经冲动的、将神经冲动传到大脑皮层听觉中枢的”结构依次是__________

加热炉点火前必须对炉膛进行（）。

A．蒸汽吹扫

B．烘炉

C．烟气分析

D．吹灰