阅读训练资料，并回答相关问题

资料一：科学家发现，够被切除胰腺后，尿液中出现了葡萄糖，并出现糖尿病病人的一些症状，科学家将正常的胰管结扎，发现胰腺大多都萎缩了，只有内部一团团的细胞﹣﹣胰岛活着，这时够的尿液中没有出现葡萄糖．

资料二：尼古丁是烟草的主要成分之一，研究表明尼古丁可造成糖尿病吸烟者的血糖水平持续升高，从而导致各种并发症风险增加．

（1）资料一中的胰腺是一种消化腺，分泌的____ 通过导管进入十二指肠，胰岛是一种____ 腺，分泌的胰岛素直接进入血液循环输送到全身各处，进而调节血糖浓度．

（2）资料二表面糖尿病吸烟者人群比糖尿病非吸烟者人群的胰岛素浓度普遍较____ 

（3）重症糖尿病患者需要肌肉注射胰岛素而不能口服，这是因为胰岛素是一种蛋白质，在消化道的____ 内会被初步消化，若肌肉注射胰岛素，则胰岛素最先到达心脏四个腔的____ 中．

    Malaysia Airlines (马航) flight MH370 disappeared from radar (雷达) screens an hour after it took off on March 8.It has 1 for more than 3 months.

    The plane may fall into the sea. China，Malaysia and many other countries have joined to search the 2 on the sea. The relatives of the 227 passengers and 12 crew (乘务人员) are 3 good news from them.

    How did the accident 4？It is said that the plane was attacked (攻击) by the terrorists. Some think there may be something wrong with the plane，and others think the accident may be 5 by the mistake of the crew. However it is 6 to tell the reason because the plane hasn't been found yet.

    It may 7 some time to find the missing plane and even more time to get to know the truth of what happened. However，we can't stop imagining what happened to the plane 8 it is found.

    Whether the missing plane is found 9 not，the whole world should pay more attention to the safety of people，especially at airports.

    We hope these people on the plane will be 10，and they can get together with their family members.