What we take from and give to the sea

    As long as we have been on earth, we have used the sea around us. We take from the ocean, and we give to it.

    We take fishes from the ocean – millions of kilograms of fish, every year, to feed millions of people. __1__. We take minerals from the ocean. One way to get salt is to place seawater in a shallow basin and leave it until it evaporates. __2__. Much gold and silver drift dissolved in the waters of the sea¹, too. But the sea does not give them up by simple evaporation. Other gifts from the sea are pearls, sponges and seaweed. Pearls become jewelry. __3__. Seaweed becomes food of many kinds – even candy, and ice cream – as well as medicine. 

    Believe it or not, fresh water is anther gift from the sea. We cannot drink ocean water. __4__. But ocean water becomes fresh water when the salts are removed. In the future, we will find ourselves depending more and more on fresh water from the sea.

    The sea gives us food, fertilizer, minerals, water, and other gifts. What do we give the sea? Garbage. __5__. Huge as it is, the ocean cannot hold all the water we pour into it, Dumping garbage into the ocean is killing off sea life2. Yet as the world population grows, we may need the sea and its gifts more than ever.

    We are finally learning that if we destroy our seas, we might also destroy ourselves. Hopefully, it is not too late.

词汇：

fertilizer/ "fɜːtɪlaɪzə / n．化肥

sponge /spɔndʒ/ n．海绵

garbage / "gɑːbɪdʒ / n．垃圾

evaporate / ɪ"væpəreɪt / v．蒸发

seaweed /"si:wi:d/ n．海草

注释：

1.Much gold and silver drift dissolved in the waters of the sea, too.还有不少金和银的漂流物溶解在海水里。

2.Dumping garbage into the ocean is killing off sea life.把垃圾往大海里倾倒就是在把海洋生物杀绝灭尽。

练习:

A.Natural sponges become cleaning aids.

B.We pollute the ocean when we use it as a garbage dump.

C.The area of the sea is becoming smaller and smaller.

D.Along with salt, other minerals are left after evaporation.

E.We even use their bones for fertilizer.

F.Some of its contents may cause illness.

空1

A:A B:B C:C D:D E:E F:F

NR下，SPS配置使用如下那种 RNTI加扰的 PDCCH进行资源调度(　)

A:SPS C-RNTI B:CS-RNTI C:C.C-RNTI D:RA-RANTI

UE在每个NR serving小区下最多监听几个通 过C-RNTI加扰的DCI Format(　)。

A:1 B:2 C:3 D:4

5GNR下，SPS配置使用如下那种RNTI加 扰的PDCCH 进行资源调度（）

A:SPSC-RNTI B:CS-RNTI C:C.C-RNTI D:RA-RANTI

对比4G，以下哪些是NR中新增的RNTI类型？

A:SFI-RNTI B:P-RNTI C:SI-RNTI D:INT-RNTI

对比4G，以下哪些是NR中新增的RNTI类型？（ ）

A:SFI-RNTI B:P-RINTI C:SI-HRINTI D:INT-RINTI

5GNR下，SPS配置使用如下那种RNTI加扰的PDCCH进行资 源调度(　)

A:SPS C-RNTI B:CS-RNTI C:CC-RNTI D:RA-RANTI

UE在每个NR serving 小区下最多监听几个通过 C-RNTI加扰 的DCI Format（）。

A:1 B:2 C:3 D:4

NR下，SPS配置使用如下那种RNTI加扰的PDCCH进行资源调度 （）

A:SPS C-RNTI B:CS-RNTI C:C.C-RNTI D:RA-RANTI