（）是指投保人在保险年度内每一年所缴的保费相等。 A.纯保费 B.死亡保费 C.自然

Last week, only two people came to look at the house, _______wanted to buy it.  [ ]

A. none of them                  

B. both of them    

C. none of whom                

D. neither of whom

我国《行政许可法》规定，通常情形下，行政机关应当自受理行政许可申请之日起( )内作出行政许可决定。

A．二十日

B．二十五日

C．十五日

D．三十日

女性，28岁。因怕热、多汗，纳亢、消瘦2月余就诊。体检：双眼突出，球结膜充血，甲状腺Ⅱ度肿大，心率100次／分，FT₃、FT₄，明显增高。（）

A.甲巯咪唑（他巴唑）每日30mg

B.丙硫氧嘧啶每日1.50mg

C.放射性碘治疗

D.甲状腺大部切除

E.生白能（粒-巨噬细胞集落刺激因子）

F.甲状腺片加甲巯咪唑（他巴唑）

G.复方碘溶液每日5滴

H.复方碘溶液每日15滴对

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.

12（）

A.need 

B.turn 

C.advance

D.vain

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