问题 单项选择题 B1型题

蜂窝织炎症状为()

A.皮色正常、皮温略高,表面静脉怒张

B.疼痛与压痛在长骨干骺端,压痛局限深在,红肿不明显

C.疼痛与压痛在关节,红肿明显,关节活动障碍

D.疼痛与压痛表浅,红肿广泛、明显

E.疼痛与压痛在长骨骨干

答案

参考答案:D

解析:早期急性血源性骨髓炎局部症状:患区剧痛,肢体半屈曲状,周围肌肉痉挛,因疼痛抗拒做主动与被动活动,局部皮温高,有局限性压痛,肿胀并不明显。化脓性关节炎主要表现为关节活动障碍,有关节压痛,红肿明显。蜂窝织炎界限不清,红肿广泛。

单项选择题
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.

5()

A.history 

B.shortcoming 

C.achievement 

D.advantage