供给曲线向右上方倾斜，表示表示当一种商品价格（）时，它的供给量（）。A.上升，不变

下列选项中描述正确的是（）

A.甲状腺素分泌过多时，可引起肢端肥大症

B.甲状腺素分泌不足时，可引起呆小症

C.甲状旁腺功能低下时，可造成骨质疏松

D.血液中抗利尿激素含量下降时，尿量减少

E.肾上腺功能不足时，可出现性早熟

使用沥青前，对炼恒温锅中的沥青须进行（）。

A、测温

B、检验分析

C、试验

D、搅拌

Should we care if over 150 known species of animals have (91) from the earth in the last fifty years Should we be concerned that there are (92) thousands of species whose very existence is (93) endangered—largely because of our activities (94) , after all, is the natural end of populations. Species are born, then (95) , and then die. Some live a (96) time, perhaps millions of years; some die more quickly. We have (97) the extinction of many species we know about, and we have undoubtedly sealed the (98) of others. In fact, there are undoubtedly many other species that have lived among us during our time on earth, but that have disappeared as a (n) (99) of our activities without our ever having known they existed.
It is hard to explain the rationale of many of us who are concerned about such matters. I have never seen a sea whale, (100) I don’t want them to become extinct. Moreover, I felt this way long before I understood anything about how they might be an important part of an ecosystem. Possibly such feelings merely reflect the cultural attitude that it is "nice" to wish other living things well; thus, the attitude is (101) . I feel nice.
There are, of course, more rational reasons for (102) the extermination of any species. For one thing, the kind of attitude that encourages or sanctions the destruction of other species is a threat (103) our own wellbeing. If such an attitude exists, we ourselves might (104) victim to it. living things (including us) might be expected to fare better where there is (105) for life. The extinction of other species could also threaten us (106) by simplifying the system of which we are a part or by destroying parts of the ecosystem (107) which we directly rely. For example, if we continue to poison the oceans (108) we are willing to believe only a few bottom dwellers are affected, we might (109) overstep some critical threshold and trigger the wholesale death of plankton, thus finding ourselves without a major (110) of the world’s food and with our oxygen supplies dwindling.

A．because

B．as if

C．and

D．even

涂料的作用有标志、装饰、保护和（）。

A.防腐作用

B.特殊作用

C.美观作用

【4】 是衡量数据传输系统在正常工作状态下传输可靠性的参数。