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问题 单项选择题

男性，16岁，因左侧颈部肿物入院；查体：左侧胸锁乳突肌外侧，锁骨上方皮下质软肿物，大小为3cm×5cm，边界不清，无压痛，穿刺为浅黄色液体，应诊断为

A．颏下皮样囊肿

B．甲状舌骨囊肿

C．胸腺咽管囊肿

D．甲状腺腺瘤

E．囊状淋巴管瘤

答案

参考答案：E

解析：根据囊状淋巴管瘤的特征可诊断。

单项选择题

中国古代住宅最主要的形式是（）。

A.四合院

B.竹楼

C.吊脚楼

D.石碉房
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单项选择题

It is clear that some chemicals can damage the health of animals and humans. (1) , this is not the only problem that (2) be caused by the careless use of chemicals. Chemicals can also (3) the ecological balance of the environment. If the ecological balance is disturbed, the results can be (4) serious.

The (5) of DDT illustrates the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer (6) many problems. It would control insects that caused dangerous diseases, (7) insects that caused billions of dollars of damage to crops every year. Governments permitted and even (8) the use of DDT. Farmers in many countries (9) to spray it on their crops. The (10) results were good: Damage to crops (11) down, and profits went up. However, the chemical had effects which the scientists didn’t see in (12) . First, it also killed insects which were the (13) enemies of the harmful insects and which were therefore beneficial to farmers. Second, and perhaps worse, DDT did not kill (14) harmful insect. A few insects had natural resistance to the chemical. They (15) and reproduced in large numbers. In a few years there were large numbers of insects which were not (16) by DDT, and there were (17) insects which could act as natural (18) on these new "super-insects". Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It (19) became necessary to find a second (20) for the effects of the first.

3（）

A.cause 

B.harm 

C.break 

D.disturb
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