| A major reason for conflict in the
animal world is territory. The male animal (21) an area. The
size of the area is sufficient to provide food for him, his (22)
and their offspring. Migrating birds, for example, (23)
up the best territory in the order of "first come, first
(24) ." The late arrivals may acquire (25)
territories, but less food is available, or they are too close to the
(26) of the enemies of the species. (27)
there is really insufficient food or the danger is very great, the animal will
not (28) . In this way, the members of the species which are
less fit will not have offspring. When A. compulsory B. essential C. necessary D. vital [单项选择]" A plural society " (in Para. 3) refers to a society where ______.
A. there are more than one race B. one ethnic group dominates over the others C. billingual education is demanded D. cultural features should be maintained [单选题]机械作业中不准( )高速行驶。
A.超 B.强行 C.抢道 [单选题]人体缺（ ）的临床表现为生长停滞，虽到了成熟阶段，却身材矮小，性发育不良，味觉和食欲减退和创伤愈合不良等。
A.钙 B.锌 C.铁 D.锰 E.镁 [判断题]NJ2机车的空气压缩机为六缸.二级.水冷式结构，有二个低压缸和四个高压缸。
A.正确 B.错误 [单选题]运输民用爆炸物品，应当遵守《民用爆炸物品安全管理条例》的相关规定，以下说法正确的是（ ）。
A.运送民用爆炸物品，需向运达地县级人民政府公安机关提出申请，核发《民用爆炸物品运输许可证》方可运输，运输过程中无需携带《民用爆炸物品运输许可证》。 B.运输车辆安全技术状况应当符合国家有关安全技术标准的要求，并按照规定悬挂或者安装符合国家标准的易燃易爆危险物品警示标志； C.运输民用爆炸物品，出现危险情况立即采取必要的应急处置措施，并报告当地交通部门，无需报告公安部门。 D.民用爆炸物品的装载符合国家有关标准和规范，通过申请许可车厢内可适当载人。 [单选题]四缸柴油机，各缸做功的间隙角度为( )。
A.45° B.30° C.120° D.180° 我来回答: 提交
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